compiler warnings: potentially uninitialized variables

... pointed out by MSVC2013

Bug: http://curl.haxx.se/bug/view.cgi?id=1391

lib/connect.c

@@ -551,7 +551,7 @@ static CURLcode trynextip(struct connectdata *conn,
 
   if(sockindex == FIRSTSOCKET) {
     Curl_addrinfo *ai = NULL;
-    int family;
+    int family = AF_UNSPEC;
 
     if(conn->tempaddr[tempindex]) {
       /* find next address in the same protocol family */

lib/easy.c

@@ -674,7 +674,7 @@ static CURLcode easy_transfer(CURLM *multi)
                            curl_multi_wait() without any filedescriptors */
 
   while(!done && !mcode) {
-    int still_running;
+    int still_running = 0;
     int ret;
 
     before = curlx_tvnow();

lib/url.c

@@ -5137,7 +5137,7 @@ static CURLcode create_conn(struct SessionHandle *data,
   char *proxy = NULL;
   bool prot_missing = FALSE;
   bool no_connections_available = FALSE;
-  bool force_reuse;
+  bool force_reuse = FALSE;
   size_t max_host_connections = Curl_multi_max_host_connections(data->multi);
   size_t max_total_connections = Curl_multi_max_total_connections(data->multi);