phy: stm32: fix a refcount leak in stm32_usbphyc_pll_enable()

This error path needs to decrement "usbphyc->n_pll_cons.counter" before
returning.

Fixes: 5b1af712 ("phy: stm32: rework PLL Lock detection")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220112111724.GB3019@kiliSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/st/phy-stm32-usbphyc.c

@@ -304,7 +304,7 @@ static int stm32_usbphyc_pll_enable(struct stm32_usbphyc *usbphyc)
 
 		ret = __stm32_usbphyc_pll_disable(usbphyc);
 		if (ret)
-			return ret;
+			goto dec_n_pll_cons;
 	}
 
 	ret = stm32_usbphyc_regulators_enable(usbphyc);