staging: rtl8821ae: Fix potential infinite loop

Smatch reports the following:
drivers/staging/rtl8821ae/rtl8821ae/hw.c:153 _rtl8821ae_set_fw_clock_on() info: ignoring unreachable code.

Upon investigation, the code in this region has the capability of creating
an infinite loop.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8821ae/rtl8821ae/hw.c

@@ -147,6 +147,7 @@ static void _rtl8821ae_set_fw_clock_on(struct ieee80211_hw *hw,
 		} else {
 			rtlhal->bfw_clk_change_in_progress = false;
 			spin_unlock_bh(&rtlpriv->locks.fw_ps_lock);
+			break;
 		}
 	}