dma-buf: fix trivial typo error

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c
index ea77701..840c7fa 100644
--- a/drivers/base/dma-buf.c
+++ b/drivers/base/dma-buf.c
@@ -491,7 +491,7 @@
  * 			dma-buf buffer.
  *
  * This function adjusts the passed in vma so that it points at the file of the
- * dma_buf operation. It alsog adjusts the starting pgoff and does bounds
+ * dma_buf operation. It also adjusts the starting pgoff and does bounds
  * checking on the size of the vma. Then it calls the exporters mmap function to
  * set up the mapping.
  *