arm: bcm235xx: clk_set_rate avoid possible NULL deref

It does not make sense first to dereference c and then
to check if it is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/arch/arm/cpu/armv7/bcm235xx/clk-core.c b/arch/arm/cpu/armv7/bcm235xx/clk-core.c
index ee4b345..89e367b 100644
--- a/arch/arm/cpu/armv7/bcm235xx/clk-core.c
+++ b/arch/arm/cpu/armv7/bcm235xx/clk-core.c
@@ -493,9 +493,9 @@
 {
 	int ret;
 
-	debug("%s: %s rate=%ld\n", __func__, c->name, rate);
 	if (!c || !c->ops || !c->ops->set_rate)
 		return -EINVAL;
+	debug("%s: %s rate=%ld\n", __func__, c->name, rate);
 
 	if (c->use_cnt)
 		return -EINVAL;