[PATCH 1/2] interworking: Check NULL string to avoid compiler warning

[Masashi Honma <masashi.honma@xxxxxxxxx>]

Fix warning by gcc 9.2.1.

interworking.c: In function ‘interworking_home_sp_cred’:
interworking.c:2263:3: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
 2263 |   wpa_msg(wpa_s, MSG_DEBUG,
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~
 2264 |    "Interworking: Search for match with SIM/USIM domain %s",
      |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2265 |    realm);
      |    ~~~~~~

Signed-off-by: Masashi Honma <masashi.honma@xxxxxxxxx>
---
 wpa_supplicant/interworking.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wpa_supplicant/interworking.c b/wpa_supplicant/interworking.c
index 0261bb7b8..d8e9c95a7 100644
--- a/wpa_supplicant/interworking.c
+++ b/wpa_supplicant/interworking.c
@@ -2262,7 +2262,7 @@ int interworking_home_sp_cred(struct wpa_supplicant *wpa_s,
 			realm++;
 		wpa_msg(wpa_s, MSG_DEBUG,
 			"Interworking: Search for match with SIM/USIM domain %s",
-			realm);
+			realm ? realm : "[NULL]");
 		if (realm &&
 		    domain_name_list_contains(domain_names, realm, 1))
 			return 1;
-- 
2.20.1


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