Fixes an uninitialized variable access in _rx_iq_calibration_loop_winbond():

    CC [M]  drivers/staging/winbond/phy_calibration.o
  drivers/staging/winbond/phy_calibration.c: In function ‘_rx_iq_calibration_loop_winbond’:
  drivers/staging/winbond/phy_calibration.c:1138: warning: ‘val’ is used uninitialized in this function

Cc: Lars Lindley <lindley@coyote.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>