PM / clk: signedness bug in of_pm_clk_add_clks()

"count" needs to be signed for the error handling to work.  I made "i"
signed as well so they match.

Fixes: 02113ba93ea4 (PM / clk: Add support for obtaining clocks from device-tree)
Cc: 4.6+ <stable@vger.kernel.org> # 4.6+
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/clock_ops.c

@@ -185,7 +185,7 @@ EXPORT_SYMBOL_GPL(of_pm_clk_add_clk);
 int of_pm_clk_add_clks(struct device *dev)
 {
 	struct clk **clks;
-	unsigned int i, count;
+	int i, count;
 	int ret;
 
 	if (!dev || !dev->of_node)