From 28ad81420723175bfb163e20406af6d4d56bf4d4 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sat, 22 Sep 2018 15:51:49 -0700
Subject: Need to check for -1, not 0, to determine if shmat() failed

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
 src/XvMC.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/XvMC.c b/src/XvMC.c
index d97861f..736760b 100644
--- a/src/XvMC.c
+++ b/src/XvMC.c
@@ -526,7 +526,7 @@ Status XvMCGetDRInfo(Display *dpy, XvPortID port,
     if (shmKey >= 0) {
 	shMem = (CARD32 *) shmat(shmKey, NULL, 0);
 	shmctl(shmKey, IPC_RMID, NULL);
-	if ( shMem ) {
+	if (shMem != (void *) -1) {
 
 	    register volatile CARD32 *shMemC = shMem;
 	    register int i;
-- 
cgit v1.2.3