Handle inbound EOF before outbound CONNECTED

Fix segmentation fault upon receiving BEV_EVENT_EOF on the inbound
bufferevent while the outbound bufferevent has not received
BEV_EVENT_CONNECTED yet.

Issue:		#124
Patch by:	Eun Soo Park

NEWS.md

@@ -1,6 +1,9 @@
 
 ### SSLsplit develop
 
+-   Fix a rare segmentation fault upon receiving EOF on the inbound connection
+    while the outbound connection has not been established yet (patch by
+    @eunsoopark, issue #124).
 -   Enable full-strength DHE and ECDHE by default, even for non-RSA leaf keys,
     in order to avoid weak cipher warnings from browsers (issue #119).
 -   Fix SSL sessions to actually time out (patch by @eunsoopark, issue #115).

pxyconn.c

@@ -1973,7 +1973,12 @@ connected:
 	}
 
 	if (events & BEV_EVENT_EOF) {
-		if (!other->closed) {
+		if (!ctx->connected) {
+			log_dbg_printf("EOF on inbound connection while "
+			               "connecting to original destination\n");
+			evutil_closesocket(ctx->fd);
+			other->closed = 1;
+		} else if (!other->closed) {
 			struct evbuffer *inbuf, *outbuf;
 			inbuf = bufferevent_get_input(bev);
 			outbuf = bufferevent_get_output(other->bev);