drm/vmwgfx: avoid null pointer dereference at failure paths

vmw_takedown_otable_base() and vmw_mob_unbind() check for
potential vmw_fifo_reserve() failure and print error message,
but then immediately dereference NULL pointer.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_mob.c

@@ -188,9 +188,10 @@ static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 
 	bo = otable->page_table->pt_bo;
 	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
-	if (unlikely(cmd == NULL))
-		DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
-
+	if (unlikely(cmd == NULL)) {
+		DRM_ERROR("Failed reserving FIFO space for OTable "
+			  "takedown.\n");
+	} else {
 		memset(cmd, 0, sizeof(*cmd));
 		cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
 		cmd->header.size = sizeof(cmd->body);
@@ -200,6 +201,7 @@ static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
 		cmd->body.validSizeInBytes = 0;
 		cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
 		vmw_fifo_commit(dev_priv, sizeof(*cmd));
+	}
 
 	if (bo) {
 		int ret;
@@ -562,11 +564,12 @@ void vmw_mob_unbind(struct vmw_private *dev_priv,
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("Failed reserving FIFO space for Memory "
 			  "Object unbinding.\n");
-	}
+	} else {
 		cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
 		cmd->header.size = sizeof(cmd->body);
 		cmd->body.mobid = mob->id;
 		vmw_fifo_commit(dev_priv, sizeof(*cmd));
+	}
 	if (bo) {
 		vmw_fence_single_bo(bo, NULL);
 		ttm_bo_unreserve(bo);