Trivial typo fix in comment

Fixing a trivial comment typo.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2400pci.c

@@ -46,7 +46,7 @@
  * These indirect registers work with busy bits,
  * and we will try maximal REGISTER_BUSY_COUNT times to access
  * the register while taking a REGISTER_BUSY_DELAY us delay
- * between each attampt. When the busy bit is still set at that time,
+ * between each attempt. When the busy bit is still set at that time,
  * the access attempt is considered to have failed,
  * and we will print an error.
  */