kprobes: get rid of distinct type warning

[Heiko Carstens <heiko.carstens@de.ibm.com>]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

Every time I see this:

kernel/kprobes.c: In function 'register_kretprobe':
kernel/kprobes.c:1038: warning: comparison of distinct pointer types lacks a cast

I'm wondering if something changed in common code and we need to do
something for s390. Apparently that's not the case.
Let's get rid of this annoying warning.

Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
 kernel/kprobes.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1035,7 +1035,7 @@ int __kprobes register_kretprobe(struct 
 	/* Pre-allocate memory for max kretprobe instances */
 	if (rp->maxactive <= 0) {
 #ifdef CONFIG_PREEMPT
-		rp->maxactive = max(10, 2 * num_possible_cpus());
+		rp->maxactive = max(10U, 2 * num_possible_cpus());
 #else
 		rp->maxactive = num_possible_cpus();
 #endif