gtp: Fix a typo

Suppport  ==> Support
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/gtp.c

@@ -436,7 +436,7 @@ static inline void gtp1_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
 	gtp1->length	= htons(payload_len);
 	gtp1->tid	= htonl(pctx->u.v1.o_tei);
 
-	/* TODO: Suppport for extension header, sequence number and N-PDU.
+	/* TODO: Support for extension header, sequence number and N-PDU.
 	 *	 Update the length field if any of them is available.
 	 */
 }