lint: Improve ffi-unsafe enum lint warning
lint: Improve ffi-unsafe enum lint warning

I think this is an improvement of the previous warning message, which
- like the comment that I removed implies - is in need of some
improvement.
I've opted to point the user in the right direction w.r.t how to fix the
problem, which I think is good form.

Not being familiar with the repr(...) attribute, I personally had to
check the lint rules myself to figure out what was wrong. Hopefully,
this will save he next person some time and headache.

Signed-off-by: Anton Lofgren <64e2cb85477d4abaea4b354af986fde12a3e64f3@op5.com>

mdinger/rust,dinfuehr/rust,AerialX/rust-rt-minimal,aepsil0n/rust,nham/rust,pelmers/rust,zaeleus/rust,ktossell/rust,seanrivera/rust,barosl/rust,zubron/rust,bombless/rust,zachwick/rust,zaeleus/rust,ktossell/rust,kwantam/rust,omasanori/rust,jashank/rust,emk/rust,vhbit/rust,l0kod/rust,quornian/rust,ruud-v-a/rust,richo/rust,dwillmer/rust,dwillmer/rust,aneeshusa/rust,seanrivera/rust,barosl/rust,barosl/rust,aepsil0n/rust,jroesch/rust,nham/rust,robertg/rust,P1start/rust,krzysz00/rust,nwin/rust,ruud-v-a/rust,miniupnp/rust,andars/rust,sae-bom/rust,philyoon/rust,victorvde/rust,vhbit/rust,hauleth/rust,AerialX/rust-rt-minimal,robertg/rust,carols10cents/rust,hauleth/rust,AerialX/rust-rt-minimal,pshc/rust,miniupnp/rust,P1start/rust,l0kod/rust,untitaker/rust,miniupnp/rust,AerialX/rust,nwin/rust,ebfull/rust,AerialX/rust-rt-minimal,dinfuehr/rust,seanrivera/rust,hauleth/rust,mihneadb/rust,omasanori/rust,AerialX/rust,zaeleus/rust,mvdnes/rust,barosl/rust,0x73/rust,aepsil0n/rust,zachwick/rust,reem/rust,mahkoh/rust,carols10cents/rust,KokaKiwi/rust,hauleth/rust,ruud-v-a/rust,nham/rust,bombless/rust,vhbit/rust,TheNeikos/rust,KokaKiwi/rust,rohitjoshi/rust,KokaKiwi/rust,jbclements/rust,quornian/rust,KokaKiwi/rust,l0kod/rust,seanrivera/rust,jbclements/rust,zaeleus/rust,ebfull/rust,graydon/rust,emk/rust,erickt/rust,krzysz00/rust,rohitjoshi/rust,defuz/rust,cllns/rust,avdi/rust,jroesch/rust,quornian/rust,nwin/rust,quornian/rust,vhbit/rust,hauleth/rust,defuz/rust,andars/rust,bombless/rust,mihneadb/rust,rohitjoshi/rust,GBGamer/rust,pshc/rust,erickt/rust,miniupnp/rust,kimroen/rust,reem/rust,defuz/rust,kwantam/rust,miniupnp/rust,P1start/rust,aneeshusa/rust,philyoon/rust,sae-bom/rust,aepsil0n/rust,jbclements/rust,jroesch/rust,dinfuehr/rust,aidancully/rust,ktossell/rust,graydon/rust,pelmers/rust,emk/rust,dinfuehr/rust,philyoon/rust,rohitjoshi/rust,zachwick/rust,erickt/rust,reem/rust,mahkoh/rust,ejjeong/rust,mvdnes/rust,jbclements/rust,GBGamer/rust,mihneadb/rust,hauleth/rust,erickt/rust,jbclements/rust,zubron/rust,pshc/rust,zubron/rust,quornian/rust,philyoon/rust,avdi/rust,aneeshusa/rust,mdinger/rust,0x73/rust,jashank/rust,robertg/rust,untitaker/rust,jbclements/rust,ktossell/rust,jroesch/rust,XMPPwocky/rust,erickt/rust,kimroen/rust,TheNeikos/rust,sae-bom/rust,jashank/rust,mvdnes/rust,philyoon/rust,XMPPwocky/rust,P1start/rust,kimroen/rust,krzysz00/rust,victorvde/rust,GBGamer/rust,zachwick/rust,mihneadb/rust,zachwick/rust,ejjeong/rust,ejjeong/rust,l0kod/rust,vhbit/rust,andars/rust,kwantam/rust,jroesch/rust,ruud-v-a/rust,andars/rust,barosl/rust,sae-bom/rust,vhbit/rust,untitaker/rust,rohitjoshi/rust,quornian/rust,aidancully/rust,nwin/rust,bombless/rust,avdi/rust,jashank/rust,mdinger/rust,graydon/rust,KokaKiwi/rust,rprichard/rust,avdi/rust,krzysz00/rust,untitaker/rust,nwin/rust,mihneadb/rust,aepsil0n/rust,mdinger/rust,avdi/rust,richo/rust,erickt/rust,graydon/rust,andars/rust,ebfull/rust,defuz/rust,0x73/rust,P1start/rust,TheNeikos/rust,mahkoh/rust,defuz/rust,krzysz00/rust,cllns/rust,emk/rust,rprichard/rust,mahkoh/rust,GBGamer/rust,l0kod/rust,ktossell/rust,andars/rust,victorvde/rust,zaeleus/rust,mvdnes/rust,victorvde/rust,0x73/rust,richo/rust,carols10cents/rust,jashank/rust,nwin/rust,kimroen/rust,omasanori/rust,XMPPwocky/rust,AerialX/rust,0x73/rust,ejjeong/rust,TheNeikos/rust,TheNeikos/rust,untitaker/rust,mahkoh/rust,sae-bom/rust,AerialX/rust,ejjeong/rust,aidancully/rust,aidancully/rust,GBGamer/rust,ruud-v-a/rust,victorvde/rust,omasanori/rust,victorvde/rust,cllns/rust,mihneadb/rust,aidancully/rust,zubron/rust,miniupnp/rust,dinfuehr/rust,XMPPwocky/rust,P1start/rust,TheNeikos/rust,quornian/rust,mahkoh/rust,kimroen/rust,GBGamer/rust,robertg/rust,miniupnp/rust,rprichard/rust,sae-bom/rust,vhbit/rust,zubron/rust,aidancully/rust,barosl/rust,pelmers/rust,krzysz00/rust,gifnksm/rust,philyoon/rust,ebfull/rust,emk/rust,mvdnes/rust,reem/rust,defuz/rust,KokaKiwi/rust,jbclements/rust,emk/rust,dwillmer/rust,miniupnp/rust,zachwick/rust,nwin/rust,kimroen/rust,AerialX/rust,dwillmer/rust,GBGamer/rust,richo/rust,gifnksm/rust,gifnksm/rust,AerialX/rust-rt-minimal,gifnksm/rust,cllns/rust,dwillmer/rust,graydon/rust,rohitjoshi/rust,bombless/rust-docs-chinese,nham/rust,avdi/rust,pshc/rust,emk/rust,richo/rust,ktossell/rust,gifnksm/rust,gifnksm/rust,jashank/rust,ruud-v-a/rust,ejjeong/rust,dwillmer/rust,jroesch/rust,reem/rust,jbclements/rust,l0kod/rust,rprichard/rust,jashank/rust,ebfull/rust,carols10cents/rust,cllns/rust,pshc/rust,zubron/rust,pshc/rust,nham/rust,aneeshusa/rust,omasanori/rust,rprichard/rust,zaeleus/rust,rprichard/rust,graydon/rust,robertg/rust,l0kod/rust,reem/rust,erickt/rust,pshc/rust,vhbit/rust,mvdnes/rust,seanrivera/rust,GBGamer/rust,aneeshusa/rust,seanrivera/rust,l0kod/rust,jroesch/rust,0x73/rust,pshc/rust,P1start/rust,kimroen/rust,carols10cents/rust,untitaker/rust,robertg/rust,pelmers/rust,dwillmer/rust,jashank/rust,AerialX/rust,0x73/rust,jroesch/rust,nwin/rust,aepsil0n/rust,zubron/rust,bombless/rust,ktossell/rust,kwantam/rust,mdinger/rust,richo/rust,mdinger/r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