checkStamp: prevent array size promotion/truncation

Calls to checkStamp are passing literals that are not 20 bytes in size. This causes a "promotion" of the size in the context of checkStamp. We can quiet these warnings by just marking the parameter as a pointer.

Note: a safer approach would be to pass a pointer and length.

This was detected by gcc 11.2.0:

ooii.c:1018:9: error: 'checkStamp' accessing 20 bytes in a region of size 11 [-Werror=stringop-overflow=] ...

assigned to @Deuce

This is third-party code, I've inspected all codepaths to ensure it's not broken as written, and am not interested in making future merges noisier. I appreciate the report though.

closed