viewer/svutil: Fix resource leak

Coverity report:

CID 1164526 (#1 of 1): Resource leak in object (CTOR_DTOR_LEAK)
2. alloc_fn: Calling allocation function socket.

The previous stream_ must be closed before opening a new one.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

viewer/svutil.cpp

@@ -422,6 +422,7 @@ SVNetwork::SVNetwork(const char* hostname, int port) {
     // Wait for server to show up.
     // Note: There is no exception handling in case the server never turns up.
 
+    Close();
     stream_ = socket(addr_info->ai_family, addr_info->ai_socktype,
                    addr_info->ai_protocol);
 
@@ -434,6 +435,7 @@ SVNetwork::SVNetwork(const char* hostname, int port) {
       sleep(1);
 #endif
 
+      Close();
       stream_ = socket(addr_info->ai_family, addr_info->ai_socktype,
                    addr_info->ai_protocol);
     }