Add an assortment of missing frees and closes.

Coverity's resource-leak checker is on the ball as usual.

windows/winhelp.c

@@ -58,6 +58,7 @@ void init_help(void)
 	HINSTANCE dllHH = load_system32_dll("hhctrl.ocx");
 	GET_WINDOWS_FUNCTION(dllHH, HtmlHelpA);
 	if (!p_HtmlHelpA) {
+            sfree(chm_path);
 	    chm_path = NULL;
 	    if (dllHH)
 		FreeLibrary(dllHH);

windows/winproxy.c

@@ -77,6 +77,10 @@ Socket platform_new_connection(SockAddr addr, const char *hostname,
             Socket ret = new_error_socket
                 ("Unable to create pipes for proxy command", plug);
             sfree(cmd);
+            CloseHandle(us_from_cmd);
+            CloseHandle(cmd_to_us);
+            CloseHandle(us_to_cmd);
+            CloseHandle(cmd_from_us);
             return ret;
         }
     }

windows/winser.c

@@ -220,6 +220,7 @@ static const char *serial_init(void *frontend_handle, void **backend_handle,
     {
 	char *msg = dupprintf("Opening serial device %s", serline);
 	logevent(serial->frontend, msg);
+        sfree(msg);
     }
 
     {