lib/bsearch: Use generic type for comparator function

Comparator function type, cmp_func_t, is defined in the types.h,
use it in bsearch() and, thus, add more sense to the corresponding
comment in the code.

Link: http://lkml.kernel.org/r/20191007135656.37734-2-andriy.shevchenko@linux.intel.com

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

include/linux/bsearch.h

@@ -5,6 +5,6 @@
 #include <linux/types.h>
 
 void *bsearch(const void *key, const void *base, size_t num, size_t size,
-	      int (*cmp)(const void *key, const void *elt));
+	      cmp_func_t cmp);
 
 #endif /* _LINUX_BSEARCH_H */