Revert "[wpa_supplicant] Cumulative patch from b8491ae5a"

This reverts commit 878cf7bcbf2d7d8f08c3d060b8c5fbfcf0743eda.

Reason for revert: git_master/sdk_phone_armv7-sdk

Change-Id: I6070fc5c1f9c20867f6dfce90e529e35578d572e
diff --git a/src/crypto/sha256.h b/src/crypto/sha256.h
index 8054bbe..5219022 100644
--- a/src/crypto/sha256.h
+++ b/src/crypto/sha256.h
@@ -20,9 +20,9 @@
 int sha256_prf_bits(const u8 *key, size_t key_len, const char *label,
 		    const u8 *data, size_t data_len, u8 *buf,
 		    size_t buf_len_bits);
-int tls_prf_sha256(const u8 *secret, size_t secret_len,
-		   const char *label, const u8 *seed, size_t seed_len,
-		   u8 *out, size_t outlen);
+void tls_prf_sha256(const u8 *secret, size_t secret_len,
+		    const char *label, const u8 *seed, size_t seed_len,
+		    u8 *out, size_t outlen);
 int hmac_sha256_kdf(const u8 *secret, size_t secret_len,
 		    const char *label, const u8 *seed, size_t seed_len,
 		    u8 *out, size_t outlen);