Fix small memory leaks in GUC checks

Follow-up commit to a9d58bfe8a3a.  Backpatch down to v16 where
this was added in order to keep the code consistent for future
backpatches.

Author: Tofig Aliev 
Reviewed-by: Daniel Gustafsson 
Reviewed-by: Masahiko Sawada 
Discussion: https://postgr.es/m/bba4313fdde9db46db279f96f3b748b1@postgrespro.ru
Backpatch-through: 16

diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 0ecff94d0ed1a9de8feb94ca8af06bf292a29528..2c8059e8d89839de64481094c7ac4d77fb8f1a79 100644 (file)
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -1092,6 +1092,8 @@ check_application_name(char **newval, void **extra, GucSource source)
        return false;
    }
 
+   guc_free(*newval);
+
    pfree(clean);
    *newval = ret;
    return true;
@@ -1128,6 +1130,8 @@ check_cluster_name(char **newval, void **extra, GucSource source)
        return false;
    }
 
+   guc_free(*newval);
+
    pfree(clean);
    *newval = ret;
    return true;