scst_local: Fix scst_local_add_target() error path

Do not return a pointer to freed memory in *out_tgt. Detected by
Coverity.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>

scst_local/scst_local.c

@@ -1968,10 +1968,10 @@ static int scst_local_add_target(const char *target_name,
 
 	res = 0;
 
-out:
 	if (out_tgt != NULL)
 		*out_tgt = tgt;
 
+out:
 	TRACE_EXIT_RES(res);
 	return res;