RADIUS: Fix a possible memory leak on an error path

Fix a possible memory leak in radius_msg_add_mppe_keys() if
os_get_random() fails.

Signed-off-by: Ayala Beker <ayala.beker@intel.com>

src/radius/radius.c

@@ -1199,8 +1199,10 @@ int radius_msg_add_mppe_keys(struct radius_msg *msg,
 	vhdr = (struct radius_attr_vendor *) pos;
 	vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
 	pos = (u8 *) (vhdr + 1);
-	if (os_get_random((u8 *) &salt, sizeof(salt)) < 0)
+	if (os_get_random((u8 *) &salt, sizeof(salt)) < 0) {
+		os_free(buf);
 		return 0;
+	}
 	salt |= 0x8000;
 	WPA_PUT_BE16(pos, salt);
 	pos += 2;