Mail: optimized discarding invalid SMTP commands. There is no need to scan buffer from s->buffer->pos, as we already scanned the buffer till "p" and wasn't able to find an LF. There is no real need for this change in SMTP, since it is at most a microoptimization of a non-common code path. Similar code in IMAP, however, will have to start scanning from "p" to be correct, since there can be newlines in IMAP literals.

--- a/src/mail/ngx_mail_parse.c
+++ b/src/mail/ngx_mail_parse.c
@@ -843,7 +843,7 @@ invalid:
 
     /* skip invalid command till LF */
 
-    for (p = s->buffer->pos; p < s->buffer->last; p++) {
+    for ( /* void */ ; p < s->buffer->last; p++) {
         if (*p == LF) {
             s->state = sw_start;
             s->buffer->pos = p + 1;