Variable rec is not used, remove it. Spotted by GCC 4.6.0:
  CC    ui/sdl.o
/src/qemu/ui/sdl.c: In function 'sdl_setdata':
/src/qemu/ui/sdl.c:90:14: error: variable 'rec' set but not used [-Werror=unused-but-set-variable]
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>