drm/vmwgfx: Handle vmalloc() failure in vmw_local_fifo_reserve()

commit f0c62e98 upstream.

If vmalloc() fails then we need to a bit of cleanup before returning.

Fixes: fb1d9738 ("drm/vmwgfx: Add DRM driver for VMware Virtual GPU")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

@@ -368,6 +368,8 @@ void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)
 				return fifo_state->static_buffer;
 			else {
 				fifo_state->dynamic_buffer = vmalloc(bytes);
+				if (!fifo_state->dynamic_buffer)
+					goto out_err;
 				return fifo_state->dynamic_buffer;
 			}
 		}