dma-buf: Fix the typo in DMA-BUF statistics doc

The kernel-doc for DMA-BUF statistics mentions /sys/kernel/dma-buf/buffers
but the correct path is /sys/kernel/dmabuf/buffers instead.
Signed-off-by: Luc Ma <luc@sietium.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/64b6749a.170a0220.3acab.2af9@mx.google.comReviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>

drivers/dma-buf/dma-buf-sysfs-stats.c

@@ -33,7 +33,7 @@
  * into their address space. This necessitated the creation of the DMA-BUF sysfs
  * statistics interface to provide per-buffer information on production systems.
  *
- * The interface at ``/sys/kernel/dma-buf/buffers`` exposes information about
+ * The interface at ``/sys/kernel/dmabuf/buffers`` exposes information about
  * every DMA-BUF when ``CONFIG_DMABUF_SYSFS_STATS`` is enabled.
  *
  * The following stats are exposed by the interface: