Fix latest pylint issues

bin/verilator_profcfunc

@@ -135,8 +135,7 @@ def profcfunc(filename):
 
     design_width = 1
     for func, func_item in vfuncs.items():
-        if design_width < len(func_item['design']):
-            design_width = len(func_item['design'])
+        design_width = max(design_width, len(func_item['design']))
 
     print("Verilog code profile:")
     print("   These are split into three categories:")

src/astgen

@@ -852,6 +852,10 @@ def write_type_tests(prefix, nodeList):
             base = "DfgVertex"
             variable = "vtxp"
             enum = "VDfgType"
+        else:
+            base = None
+            variable = None
+            enum = None
         for node in nodeList:
             fh.write(
                 "template<> inline bool {b}::privateTypeTest<{p}{n}>(const {b}* {v}) {{ ".format(

src/bisonpre

@@ -11,11 +11,26 @@ import sys
 
 ######################################################################
 
+def bison_version_check():
+    with subprocess.Popen(Args.yacc + " --version", shell=True, stdout=subprocess.PIPE) as sp:
+        out = str(sp.stdout.read())
+    match = re.search(r'([0-9]+\.[0-9]+)', out)
+    if match:
+        v = float(match.group(1))
+        if v < 1.875:
+            sys.exit("bisonpre: %Error: '" + Args.yacc + "' is version " + v +
+                     "; version 1.875 or newer is required\n")
+        return v
+
+    sys.exit("bisonpre: %Error: '" + Args.yacc + "' is not installed, or not working\n")
+
+
+Bison_Version = bison_version_check()
+
 
 def process():
     unlink_outputs()
 
-    bison_version_check()
     supports_report = Bison_Version >= 2.3
     # supports_counter_examples = Bison_Version >= 3.8
 
@@ -84,22 +99,6 @@ def unlink_outputs():
     # We don't remove .output file, as it's useful for debugging errors
 
 
-def bison_version_check():
-    with subprocess.Popen(Args.yacc + " --version", shell=True, stdout=subprocess.PIPE) as sp:
-        out = str(sp.stdout.read())
-    match = re.search(r'([0-9]+\.[0-9]+)', out)
-    if match:
-        v = float(match.group(1))
-        if v < 1.875:
-            sys.exit("bisonpre: %Error: '" + Args.yacc + "' is version " + v +
-                     "; version 1.875 or newer is required\n")
-        global Bison_Version  # pylint: disable=global-variable-undefined
-        Bison_Version = v
-        return
-
-    sys.exit("bisonpre: %Error: '" + Args.yacc + "' is not installed, or not working\n")
-
-
 def clean_output(filename, outname, is_output, is_c):
     print("  edit " + filename + " " + outname)