driver-hidpp10: remove a redundant character array null check
driver-hidpp10: remove a redundant character array null check

It is never null. Fixes a 'pointer-bool-conversion' warning by clang.

libratbag/libratbag,libratbag/libratbag,whot/libratbag,libratbag/libratbag,whot/libratbag,whot/libratbag