net/ixgbe: remove mild profanity

At the tail end of comment about barriers (I feel your pain);
remove mild profanity.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/ixgbe/ixgbe_rxtx.c

@@ -2057,8 +2057,7 @@ next_desc:
 		 * of the ixgbe PMD.
 		 *
 		 * TODO:
-		 *    - Get rid of "volatile" crap and let the compiler do its
-		 *      job.
+		 *    - Get rid of "volatile" and let the compiler do its job.
 		 *    - Use the proper memory barrier (rte_rmb()) to ensure the
 		 *      memory ordering below.
 		 */