clk: socfpga: Use NULL instead of 0

'div_reg' is a pointer. Assign NULL instead of 0.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Dinh Nguyen <dinguyen@altera.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c
index c378489..5983a26 100644
--- a/drivers/clk/socfpga/clk.c
+++ b/drivers/clk/socfpga/clk.c
@@ -290,7 +290,7 @@
 		socfpga_clk->shift = div_reg[1];
 		socfpga_clk->width = div_reg[2];
 	} else {
-		socfpga_clk->div_reg = 0;
+		socfpga_clk->div_reg = NULL;
 	}
 
 	of_property_read_string(node, "clock-output-names", &clk_name);