[media] omap3isp: ispqueue: Fix uninitialized variable compiler warnings

drivers/media/platform/omap3isp/ispqueue.c:399:18: warning: 'pa' may be
used uninitialized in this function [-Wuninitialized]
This is a false positive but the compiler has no way to know about it,
so initialize the variable to 0.
drivers/media/platform/omap3isp/ispqueue.c:445:6: warning:
'vm_page_prot' may be used uninitialized in this function
[-Wuninitialized]
This is a false positive and the compiler should know better. Use
uninitialized_var().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/omap3isp/ispqueue.c

@@ -366,7 +366,7 @@ static int isp_video_buffer_prepare_pfnmap(struct isp_video_buffer *buf)
 	unsigned long this_pfn;
 	unsigned long start;
 	unsigned long end;
-	dma_addr_t pa;
+	dma_addr_t pa = 0;
 	int ret = -EFAULT;
 
 	start = buf->vbuf.m.userptr;
@@ -419,7 +419,7 @@ done:
 static int isp_video_buffer_prepare_vm_flags(struct isp_video_buffer *buf)
 {
 	struct vm_area_struct *vma;
-	pgprot_t vm_page_prot;
+	pgprot_t uninitialized_var(vm_page_prot);
 	unsigned long start;
 	unsigned long end;
 	int ret = -EFAULT;