gssapi: Release buffer on error path (GHSL-2023-035)

Thanks Phil Turnbull from GitHub

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/gssapi.c

@@ -350,6 +350,7 @@ static char *ssh_gssapi_name_to_char(gss_name_t name)
                          min_stat);
     ptr = malloc(buffer.length + 1);
     if (ptr == NULL) {
+        gss_release_buffer(&min_stat, &buffer);
         return NULL;
     }
     memcpy(ptr, buffer.value, buffer.length);