Adjust pmc_thread_descriptor_pool_drain() definition to avoid clang 15 warning

With clang 15, the following -Werror warning is produced:

    sys/dev/hwpmc/hwpmc_mod.c:2462:33: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
    pmc_thread_descriptor_pool_drain()
                                    ^
                                     void

This is because pmc_thread_descriptor_pool_drain() is declared with a
(void) argument list, but defined with an empty argument list. Make the
definition match the declaration.

MFC after:	3 days

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/dev/hwpmc/hwpmc_mod.c b/sys/dev/hwpmc/hwpmc_mod.c
index 1a7f2869d9b9..308b0bdff1bb 100644
--- a/sys/dev/hwpmc/hwpmc_mod.c
+++ b/sys/dev/hwpmc/hwpmc_mod.c
@@ -2459,7 +2459,7 @@ pmc_thread_descriptor_pool_free_task(void *arg __unused, int pending __unused)
  * Drain the thread free pool, freeing all allocations.
  */
 static void
-pmc_thread_descriptor_pool_drain()
+pmc_thread_descriptor_pool_drain(void)
 {
 	struct pmc_thread *pt, *next;