drm/mgag200: free memory allocated with alloc_apertures()
drm/mgag200: free memory allocated with alloc_apertures()

Fix a memory leak by deallocating the memory we got from
alloc_apertures().

Signed-off-by: Tommi Rantala <a508c38f12207ca59f3b24736fbd43e1ad6cc297@gmail.com>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas