[PATCH weston] compositor: Bail out if prev is NULL in clip_pointer_motion()

[Scott Moreau]

We can hit this case if both the preceding calls to
pixman_region32_contains_point() return false.
---
 src/compositor.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/compositor.c b/src/compositor.c
index e0e0bee..dc878ad 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -1579,7 +1579,10 @@ clip_pointer_motion(struct weston_input_device *device,
 						   old_x, old_y, NULL))
 			prev = output;
 	}
-	
+
+	if (!prev)
+		return;
+
 	if (!valid) {
 		if (x < prev->x)
 			*fx = wl_fixed_from_int(prev->x);
-- 
1.7.7.6