kernel/params.c: remove sparse-warning (different signedness)

Fixing:
  CHECK   kernel/params.c
kernel/params.c:329:41: warning: incorrect type in argument 8 (different signedness)
kernel/params.c:329:41:    expected int *num
kernel/params.c:329:41:    got unsigned int *

Signed-off-by: Richard Knutsson <ricknu-0@student.ltu.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/params.c

@@ -272,7 +272,7 @@ static int param_array(const char *name,
 		       unsigned int min, unsigned int max,
 		       void *elem, int elemsize,
 		       int (*set)(const char *, struct kernel_param *kp),
-		       int *num)
+		       unsigned int *num)
 {
 	int ret;
 	struct kernel_param kp;