[PATCH -next] dma-fence: Make symbol 'dma_fence_lockdep_map' static

The sparse tool complains as follows:

drivers/dma-buf/dma-fence.c:249:25: warning:
 symbol 'dma_fence_lockdep_map' was not declared. Should it be static?

This variable is not used outside of dma-fence.c, so this commit
marks it static.

Fixes: 5fbff813a4a3 ("dma-fence: basic lockdep annotations")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wei Yongjun <redacted>
---
 drivers/dma-buf/dma-fence.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index af1d8ea926b3..43624b4ee13d 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c

@@ -246,7 +246,7 @@ EXPORT_SYMBOL(dma_fence_context_alloc);
  *   concerned.
  */
 #ifdef CONFIG_LOCKDEP
-struct lockdep_map	dma_fence_lockdep_map = {
+static struct lockdep_map dma_fence_lockdep_map = {
 	.name = "dma_fence_map"
 };