Fix use after free.

ssl/s3_pkt.c

diff --git a/ssl/s3_pkt.c b/ssl/s3_pkt.c
index b9e45c7..d601a18 100644
--- a/ssl/s3_pkt.c
+++ b/ssl/s3_pkt.c
@@ -1334,7 +1334,7 @@
 				{
 				s->rstate=SSL_ST_READ_HEADER;
 				rr->off=0;
-				if (s->mode & SSL_MODE_RELEASE_BUFFERS)
+				if (s->mode & SSL_MODE_RELEASE_BUFFERS && s->s3->rbuf.left == 0)
 					ssl3_release_read_buffer(s);
 				}
 			}