Coverity still doesn't believe in error codes...
Coverity still doesn't believe in error codes...

So also test fbuf here.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

rhboot/efivar,vathpela/efivar-devel,rhboot/efivar,rhinstaller/efivar,rhinstaller/efivar