drm/vmwgfx: Zero initialize handle in vmw_execbuf_process

When building with -Wsometimes-uninitialized, Clang warns:

drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c:3964:7: warning: variable
'handle' is used uninitialized whenever '?:' condition is false
[-Wsometimes-uninitialized]

It's not wrong; however, in practice, this is never an issue because
the value of handle isn't used when user_fence_rep is NULL because
vmw_execbuf_copy_fence_user returns immediately when that is the case.
Just zero initialize this variable so that Clang no longer warns.

Link: https://github.com/ClangBuiltLinux/linux/issues/397Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Deepak Rawat <drawat@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c

@@ -3620,7 +3620,7 @@ int vmw_execbuf_process(struct drm_file *file_priv,
 	struct vmw_sw_context *sw_context = &dev_priv->ctx;
 	struct vmw_fence_obj *fence = NULL;
 	struct vmw_cmdbuf_header *header;
-	uint32_t handle;
+	uint32_t handle = 0;
 	int ret;
 	int32_t out_fence_fd = -1;
 	struct sync_file *sync_file = NULL;