Properly check mmap return value

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5150>
2020-05-21 18:51:06 +02:00
parent 38f32372aa
commit be71e2fd08
1 changed files with 1 additions and 1 deletions
@@ -332,7 +332,7 @@ find_device(void)
 		err(1, "could not open /dev/mem");

 	dev.io = mmap(0, dev.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, dev.base);
-	if (!dev.io) {
+	if (dev.io == MAP_FAILED) {
 		close(fd);
 		err(1, "could not map device");
 	}