MLK-11918-3 video: mxc ipuv3 fb: Fix bailout path for ioctrl FBIO_ALLOC

MLK-11918-3 video: mxc ipuv3 fb: Fix bailout path for ioctrl FBIO_ALLOC

Resources(kmem and DMA) should be freed correctly in the bailout path of
ioctrl FBIO_ALLOC.  We should also delete mem->list from fb_alloc_list
in the bailout path if necessary.

The kmem leakage issue is reported by Coverity:
			if (get_user(size, argp))
Resource leak (RESOURCE_LEAK)
leaked_storage: Variable mem going out of scope leaks the storage it points to.
				return -EFAULT;

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>