kmemleak disables itself if an internal error has been encountered. If
this happens, any attempt to write into /sys/kernel/debug/kmemleak
triggers the error "Operation not permitted". Suppress this error
message instead of displaying it on stdout.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 check | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/check b/check
index f170458fdb69..d2232828a9e3 100755
--- a/check
+++ b/check
@@ -233,7 +233,7 @@ _check_kmemleak() {
 
 	((KMEMLEAK)) || return 0
 
-	echo scan > "$KMEMLEAK_FILE"
+	{ echo scan > "$KMEMLEAK_FILE"; } 2>/dev/null || return 0
 	sleep 1
 	kmemleak=$(cat "$KMEMLEAK_FILE")