PM / Clocks: Remove redundant NULL checks before kfree()

Since kfree() checks it its argument is not NULL, it is not necessary
to duplicate this check in __pm_clk_remove().

[rjw: Added the changelog.]
Signed-off-by: NJonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

drivers/base/power/clock_ops.c

@@ -104,9 +104,7 @@ static void __pm_clk_remove(struct pm_clock_entry *ce)
 			clk_put(ce->clk);
 	}
 
-	if (ce->con_id)
-		kfree(ce->con_id);
-
+	kfree(ce->con_id);
 	kfree(ce);
 }