sh: fix clk_get() error handling

clk_get() returns an ERR_PTR(errno) on error and not NULL.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/mach-ecovec24/setup.c

@@ -1248,14 +1248,14 @@ static int __init arch_setup(void)
 
 	/* set SPU2 clock to 83.4 MHz */
 	clk = clk_get(NULL, "spu_clk");
-	if (clk) {
+	if (!IS_ERR(clk)) {
 		clk_set_rate(clk, clk_round_rate(clk, 83333333));
 		clk_put(clk);
 	}
 
 	/* change parent of FSI B */
 	clk = clk_get(NULL, "fsib_clk");
-	if (clk) {
+	if (!IS_ERR(clk)) {
 		clk_register(&fsimckb_clk);
 		clk_set_parent(clk, &fsimckb_clk);
 		clk_set_rate(clk, 11000);
@@ -1273,7 +1273,7 @@ static int __init arch_setup(void)
 
 	/* set VPU clock to 166 MHz */
 	clk = clk_get(NULL, "vpu_clk");
-	if (clk) {
+	if (!IS_ERR(clk)) {
 		clk_set_rate(clk, clk_round_rate(clk, 166000000));
 		clk_put(clk);
 	}