imap-send: fix bug causing cfg->folder being set to NULL

6d1f198 (imap-send: fix leaking memory in `imap_server_conf`, 2024-06-07)
resulted a change in static int git_imap_config which resulted in cfg->folder
being incorrectly set to NULL in case imap.user, imap.pass, imap.tunnel and
imap.authmethod were defined. Because of this, since Git 2.46.0,
git-imap-send is not usable at all. The bug seems to have been unnoticed for
a long time, likely due to better options like git-send-email.

Signed-off-by: Aditya Garg <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: AdityaGarg8

imap-send.c

@@ -1316,16 +1316,16 @@ static int git_imap_config(const char *var, const char *val,
 		FREE_AND_NULL(cfg->folder);
 		return git_config_string(&cfg->folder, var, val);
 	} else if (!strcmp("imap.user", var)) {
-		FREE_AND_NULL(cfg->folder);
+		FREE_AND_NULL(cfg->user);
 		return git_config_string(&cfg->user, var, val);
 	} else if (!strcmp("imap.pass", var)) {
-		FREE_AND_NULL(cfg->folder);
+		FREE_AND_NULL(cfg->pass);
 		return git_config_string(&cfg->pass, var, val);
 	} else if (!strcmp("imap.tunnel", var)) {
-		FREE_AND_NULL(cfg->folder);
+		FREE_AND_NULL(cfg->tunnel);
 		return git_config_string(&cfg->tunnel, var, val);
 	} else if (!strcmp("imap.authmethod", var)) {
-		FREE_AND_NULL(cfg->folder);
+		FREE_AND_NULL(cfg->auth_method);
 		return git_config_string(&cfg->auth_method, var, val);
 	} else if (!strcmp("imap.port", var)) {
 		cfg->port = git_config_int(var, val, ctx->kvi);