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/sha1-prf.c b/src/crypto/sha1-prf.c
index 1385149..4b2d137 100644
--- a/src/crypto/sha1-prf.c
+++ b/src/crypto/sha1-prf.c
@@ -61,7 +61,7 @@
 		}
 		counter++;
 	}
-	forced_memzero(hash, sizeof(hash));
+	os_memset(hash, 0, sizeof(hash));
 
 	return 0;
 }