Exit more cleanly when ports are occupied

SABnzbd.py

@@ -669,7 +669,11 @@ def is_sabnzbd_running(url):
 
 
 def find_free_port(host, currentport):
-    """ Return a free port, 0 when nothing is free """
+    """ Return a free port if allowed, 0 when nothing is free """
+    if sabnzbd.cfg.fixed_ports():
+        # Port found before, so we bail out
+        raise IOError
+
     n = 0
     while n < 10 and currentport <= 49151:
         try:
@@ -1042,9 +1046,6 @@ def main():
         if url and check_for_sabnzbd(url, upload_nzbs, autobrowser):
             exit_sab(0)
 
-    # We only performe the free-port check on first start-up
-    # because we want to be sure we can bind to something!
-    if not sabnzbd.cfg.fixed_ports():
     # SSL
     if enable_https:
         port = https_port or cherryport