MLK-11952 Video: IPU: Fix dereferencing NULL pointer problem

By Coverity check,  the clk_set_rate function dereferences the clk pointer
without checking whether it is NULL. This may cause problem when clk is NULL.
Fix the problem by adding NULL check.

Signed-off-by: Ye.Li <B37916@freescale.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/video/ipu_common.c b/drivers/video/ipu_common.c
index 0efb3db..83ac846 100644
--- a/drivers/video/ipu_common.c
+++ b/drivers/video/ipu_common.c
@@ -128,6 +128,10 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
 {
 	if (clk && clk->set_rate)
 		clk->set_rate(clk, rate);
+
+	if (!clk)
+		return 0;
+	
 	return clk->rate;
 }