tests: Fix build without CONFIG_ERP=y

hmac_sha256_kdf() got pulled in only if CONFIG_ERP=y is set. Fix
test_sha256() by making the test case conditional on the function being
present.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/crypto_module_tests.c

@@ -1576,6 +1576,7 @@ static int test_sha256(void)
 
 	key = os_malloc(8161);
 	if (key) {
+#ifdef CONFIG_HMAC_SHA256_KDF
 		int res;
 
 		res = hmac_sha256_kdf((u8 *) "secret", 6, "label",
@@ -1593,6 +1594,7 @@ static int test_sha256(void)
 				   "Unexpected hmac_sha256_kdf(outlen=8161) success");
 			errors++;
 		}
+#endif /* CONFIG_HMAC_SHA256_KDF */
 
 		os_free(key);
 	}

wpa_supplicant/Android.mk

@@ -1277,6 +1277,7 @@ ifdef NEED_TLS_PRF_SHA256
 SHA256OBJS += src/crypto/sha256-tlsprf.c
 endif
 ifdef NEED_HMAC_SHA256_KDF
+L_CFLAGS += -DCONFIG_HMAC_SHA256_KDF
 SHA256OBJS += src/crypto/sha256-kdf.c
 endif
 OBJS += $(SHA256OBJS)

wpa_supplicant/Makefile

@@ -1301,6 +1301,7 @@ ifdef NEED_TLS_PRF_SHA256
 SHA256OBJS += ../src/crypto/sha256-tlsprf.o
 endif
 ifdef NEED_HMAC_SHA256_KDF
+CFLAGS += -DCONFIG_HMAC_SHA256_KDF
 OBJS += ../src/crypto/sha256-kdf.o
 endif
 OBJS += $(SHA256OBJS)