usb: gadget: lpc32xx_udc: fix wrong clk_put() sequence

This patch fixes the following Coccinelle error:

drivers/usb/gadget/lpc32xx_udc.c:3313:1-7: ERROR: \
	missing clk_put; clk_get on line 3139 and \
	execution via conditional on line 3146

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>