Here is a better patch. Somehow I pasted an older version of my edits:
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% diff ./match.c /home/millerig/osrc/openssh-7.2p2/match.c
121a122
> char *low_string = 0;
156,159c157,168
< if (match_pattern(string, sub)) {
< if (negated)
< return -1; /* Negative */
< else
---
> if (dolower) {
> u_int j;
> if (low_string) free(low_string);
> low_string = malloc(strlen(string) + 1);
> for (j = 0; j < strlen(string); ++j) low_string[j] = tolower(string[j]);
> low_string[j] = 0;
> }
> if (match_pattern((dolower ? low_string : string), sub)) {
> if (negated) {
> got_positive = -1; /* Negative */
> break;
> } else
165,166c174,175
< * Return success if got a positive match. If there was a negative
< * match, we have already returned -1 and never get here.
---
> * Return success if there was a positive match;
> * return -1 if there was a negative match.
167a177
> if (low_string) free(low_string);
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