autofs: fix doubled word

Change doubled word "is" to "it is".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Ian Kent <raven@themaw.net>
Link: http://lkml.kernel.org/r/5a82befd-40f8-8dc0-3498-cbc0436cad9b@infradead.orgSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/uapi/linux/auto_dev-ioctl.h

@@ -82,7 +82,7 @@ struct args_ismountpoint {
 /*
  * All the ioctls use this structure.
  * When sending a path size must account for the total length
- * of the chunk of memory otherwise is is the size of the
+ * of the chunk of memory otherwise it is the size of the
  * structure.
  */