staging: rtl8192u: Replace "is is" with "is"

This patch replace "is is " with "is". The replacement couldn't be
automated because sometimes the first "is" was meant to be another
word.
Signed-off-by: Nsimran singhal <singhalsimran0@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r819xU_cmdpkt.c

@@ -495,7 +495,7 @@ u32 cmpk_message_handle_rx(struct net_device *dev,
 	u8			element_id;
 	u8			*pcmd_buff;
 
-	/* 0. Check inpt arguments. If is is a command queue message or
+	/* 0. Check inpt arguments. It is a command queue message or
 	 * pointer is null.
 	 */
 	if (pstats == NULL)