base,cpu,dev: Simplify ListenSocket::listen().

Remove the "reuse" parameter which default to true and was always
also explicitly set to true. Tidy up the code itself slightly, mostly
by using "panic_if" to remove some nesting.

Change-Id: Ie23971aabf2fe4252d27f1887468360722a72379
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69159
Maintainer: Gabe Black <gabeblack@google.com>
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/nativetrace.cc

@@ -45,8 +45,7 @@ NativeTrace::NativeTrace(const Params &p)
         fatal("All listeners are disabled!");
 
     int port = 8000;
-    while (!native_listener.listen(port, true))
-    {
+    while (!native_listener.listen(port)) {
         DPRINTF(GDBMisc, "Can't bind port %d\n", port);
         port++;
     }