fix dropck overflow error message
fix dropck overflow error message

Perf numbers:

Before this patchset:
572.70user 5.52system 7:33.21elapsed 127%CPU (0avgtext+0avgdata 1173368maxresident)k
llvm-time: 385.858

After this patch:
557.84user 5.73system 7:22.10elapsed 127%CPU (0avgtext+0avgdata 1142848maxresident)k
llvm-time: 385.834

nice 2.5% perf improvement

pshc/rust,GBGamer/rust,l0kod/rust,dwillmer/rust,dwillmer/rust,GBGamer/rust,pshc/rust,pshc/rust,graydon/rust,GBGamer/rust,zubron/rust,zubron/rust,l0kod/rust,GBGamer/rust,pshc/rust,aidancully/rust,dwillmer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,zubron/rust,graydon/rust,l0kod/rust,l0kod/rust,dwillmer/rust,graydon/rust,dwillmer/rust,l0kod/rust,dwillmer/rust,l0kod/rust,pshc/rust,dwillmer/rust,aidancully/rust,zubron/rust,graydon/rust,aidancully/rust,zubron/rust,pshc/rust,pshc/rust,zubron/rust,GBGamer/rust,l0kod/rust,pshc/rust,dwillmer/rust,zubron/rust,aidancully/rust,zubron/rust,GBGamer/rust,aidancully/rust,graydon/rust,l0kod/rust