sh: clkfwk: fixup unsed variable warning

This patch solves above warning

${LINUX}/drivers/sh/clk/cpg.c:404:6: warning: \
unused variable 'val' [-Wunused-variable]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

drivers/sh/clk/cpg.c

@@ -401,7 +401,6 @@ static int fsidiv_enable(struct clk *clk)
 
 static int fsidiv_set_rate(struct clk *clk, unsigned long rate)
 {
-	u32 val;
 	int idx;
 
 	idx = (clk->parent->rate / rate) & 0xffff;