set encodedPoint to NULL after freeing it

ssl/s3_srvr.c

diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index 0f203ec..286af3a 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -1869,6 +1869,7 @@
 			    (unsigned char *)encodedPoint, 
 			    encodedlen);
 			OPENSSL_free(encodedPoint);
+			encodedPoint = NULL;
 			p += encodedlen;
 			}
 #endif