lib: flake8 cleanup

Signed-off-by: Elms <elmsfu@freshred.net>

v2x/lib/argparse_extra.py

diff --git a/v2x/lib/argparse_extra.py b/v2x/lib/argparse_extra.py
index 6c86f4e..9be1116 100644
--- a/v2x/lib/argparse_extra.py
+++ b/v2x/lib/argparse_extra.py
@@ -20,7 +20,7 @@
     True
     >>> parser.parse_args(['--arg', 'no']).arg
     False
-    >>> 
+    >>>
 
     Use like this for a default on argument which can be turned off;
     >>> parser = argparse.ArgumentParser()
@@ -37,7 +37,7 @@
     True
     >>> parser.parse_args(['--arg', 'no']).arg
     False
-    >>> 
+    >>>
 
     Converts the following (in can capitalization) to `True`:
         * yes

v2x/lib/mux.py

diff --git a/v2x/lib/mux.py b/v2x/lib/mux.py
index 910a6b6..60c24a4 100644
--- a/v2x/lib/mux.py
+++ b/v2x/lib/mux.py
@@ -156,13 +156,17 @@
         pb_type_xml.append(ET.Comment(comment))
 
     for port in pins:
-        #assert port.index < port.width, (
-        #    "Pin index {} >= width {} for pin {} {}".format(port.index, port.width, port.name, port.pin_type))
+        assert port.index < port.width, (
+            "Pin index {} >= width {} for pin {} {}".format(
+                port.index, port.width, port.name, port.pin_type
+            )
+        )
         if mux_type == MuxType.ROUTING and port.pin_type == MuxPinType.SELECT:
             continue
 
-        assert port.width == 1 or port.data_width == 1, 'Only one of width(%d) or data_width(%d) may > 1 for pin %s' % (
-            port.width, port.data_width, port.name
+        assert port.width == 1 or port.data_width == 1, (
+            'Only one of width(%d) or data_width(%d) may > 1 for pin %s' %
+            (port.width, port.data_width, port.name)
         )
 
         if port.width == 1 and port.data_width > 1: