python/semanage: check variable type of port before trying to split

While using Ansible's Selinux module to manage ports, I discovered
that numerical ports caused an unhandled exception in 'seobject.py'.
This appears to be a bug, and I am proposing a fix which checks the
type of the argument before operating on it.  This maintains the
original functionality in the case of a string, and acts in the same
fashion if you supply an integer.

I did not find any open bug report against the SELinux project. The
downstream bug report is here:
https://github.com/ansible/ansible/issues/60968

Signed-off-by: Joshua Schmidlkofer <joshua@joshuainnovates.us>

python/semanage/seobject.py

@@ -1070,7 +1070,11 @@ class portRecords(semanageRecords):
         if port == "":
             raise ValueError(_("Port is required"))
 
-        ports = port.split("-")
+        if isinstance(port, str):
+            ports = port.split('-', 1)
+        else:
+            ports = (port,)
+
         if len(ports) == 1:
             high = low = int(ports[0])
         else: