drm: Fix error message in drmWaitVBlank

If clock_gettime did fail, it would return -1 and set errno.
What we really want to strerror() is the errno.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>

diff --git a/xf86drm.c b/xf86drm.c
index 2a74c80..4791a05 100644 (file)
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -1946,7 +1946,7 @@ int drmWaitVBlank(int fd, drmVBlankPtr vbl)
 
     ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
     if (ret < 0) {
-       fprintf(stderr, "clock_gettime failed: %s\n", strerror(ret));
+       fprintf(stderr, "clock_gettime failed: %s\n", strerror(errno));
        goto out;
     }
     timeout.tv_sec++;