Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index ef3dc4b..74add2d 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1136,7 +1136,7 @@
  * earlier versions of GFS2 have a bug in the stuffed file reading
  * code which will result in a buffer overrun if the size is larger
  * than the max stuffed file size. In order to prevent this from
- * occuring, such files are unstuffed, but in other cases we can
+ * occurring, such files are unstuffed, but in other cases we can
  * just update the inode size directly.
  *
  * Returns: 0 on success, or -ve on error