staging: vboxvideo: Fix line size exceeding 80 columns.

This patch fixes the checkpatch.pl warning:

WARNING: line over 80 characters
+               vbva = (void __force *)vbox->vbva_buffers + i *
VBVA_MIN_BUFFER_SIZE;
Signed-off-by: Daniel Junho <djunho@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxvideo/vbox_main.c

@@ -61,7 +61,8 @@ void vbox_enable_accel(struct vbox_private *vbox)
 		if (vbox->vbva_info[i].vbva)
 			continue;
 
-		vbva = (void __force *)vbox->vbva_buffers + i * VBVA_MIN_BUFFER_SIZE;
+		vbva = (void __force *)vbox->vbva_buffers +
+			i * VBVA_MIN_BUFFER_SIZE;
 		if (!vbva_enable(&vbox->vbva_info[i],
 				 vbox->guest_pool, vbva, i)) {
 			/* very old host or driver error. */