MIPS: BCM63xx: Add check for NULL for clk in clk_enable

Check clk for NULL before calling clk_enable_unlocked where clk
is dereferenced. There is such check in other implementations
of clk_enable.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: e7300d0 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>

arch/mips/bcm63xx/clk.c

@@ -361,6 +361,9 @@ static struct clk clk_periph = {
  */
 int clk_enable(struct clk *clk)
 {
+	if (!clk)
+		return;
+
 	mutex_lock(&clocks_mutex);
 	clk_enable_unlocked(clk);
 	mutex_unlock(&clocks_mutex);