[patch] video: of: display_timing: double free on error

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The display_timings_release() function frees "disp" and we free it
again on the next line.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
index 987edf1..5c098d5 100644
--- a/drivers/video/of_display_timing.c
+++ b/drivers/video/of_display_timing.c
@@ -236,6 +236,7 @@ timingfail:
 	if (native_mode)
 		of_node_put(native_mode);
 	display_timings_release(disp);
+	disp = NULL;
 entryfail:
 	kfree(disp);
 dispfail:
--
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