Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 9e7a12d..a6deef4 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -826,7 +826,7 @@
  *	@c: I2O controller
  *
  *	This function tries to get a message frame. If no message frame is
- *	available do not wait until one is availabe (see also i2o_msg_get_wait).
+ *	available do not wait until one is available (see also i2o_msg_get_wait).
  *	The returned pointer to the message frame is not in I/O memory, it is
  *	allocated from a mempool. But because a MFA is allocated from the
  *	controller too it is guaranteed that i2o_msg_post() will never fail.