[PATCH] Documentation: fix dma-buf.rst underline length warning

[Randy Dunlap]

From: Randy Dunlap <rdunlap at infradead.org>

/home/rdunlap/lnx/lnx-59-rc2/Documentation/driver-api/dma-buf.rst:182: WARNING: Title underline too short.
Indefinite DMA Fences
~~~~~~~~~~~~~~~~~~~~

Fixes: 72b6ede73623 ("dma-buf.rst: Document why indefinite fences are a bad idea")
Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Dave Airlie <airlied at redhat.com>
---
 Documentation/driver-api/dma-buf.rst |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- lnx-59-rc2.orig/Documentation/driver-api/dma-buf.rst
+++ lnx-59-rc2/Documentation/driver-api/dma-buf.rst
@@ -179,7 +179,7 @@ DMA Fence uABI/Sync File
    :internal:
 
 Indefinite DMA Fences
-~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~
 
 At various times &dma_fence with an indefinite time until dma_fence_wait()
 finishes have been proposed. Examples include: