Adjust t4_tracer_mod{load,unload}() definitions to avoid clang 15 warnings
With clang 15, the following -Werror warnings are produced:
sys/dev/cxgbe/t4_tracer.c:234:18: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] t4_tracer_modload() ^ void sys/dev/cxgbe/t4_tracer.c:243:20: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] t4_tracer_modunload() ^ void
This is because t4_tracer_modload() and t4_tracer_modunload() are
declared with a (void) argument list, but defined with an empty argument
list. Make the definitions match the declarations.
MFC after: 3 days