Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index dfa5beb..64f30ec 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -73,7 +73,7 @@
 	tcp_advance_send_head(sk, skb);
 	tp->snd_nxt = TCP_SKB_CB(skb)->end_seq;
 
-	/* Don't override Nagle indefinately with F-RTO */
+	/* Don't override Nagle indefinitely with F-RTO */
 	if (tp->frto_counter == 2)
 		tp->frto_counter = 3;