With clang 15, the following -Werror warning is produced:
sys/dev/agp/agp.c:910:16: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
agp_find_device()
^
void
This is because agp_find_device() is declared with a (void) argument
list, and defined with an empty argument list. Make the definition match
the declaration.
MFC after: 3 days
c0817e2aba