AP_HAL_ChibiOS: addressed reviewed comments

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -2205,29 +2205,28 @@ def process_line(line):
         env_vars[a[1]] = ' '.join(a[2:])
 
 
-def process_file(fname,extra_hwdef):
+def process_file(filename):
     '''process a hwdef.dat file'''
-    for filename in [fname,extra_hwdef]:
-        try:
-            f = open(filename, "r")
-        except Exception:
-            error("Unable to open file %s" % filename)
-        for line in f.readlines():
-            line = line.split('#')[0] # ensure we discard the comments
-            line = line.strip()
-            if len(line) == 0 or line[0] == '#':
-                continue
-            a = shlex.split(line)
-            if a[0] == "include" and len(a) > 1:
-                include_file = a[1]
-                if include_file[0] != '/':
-                    dir = os.path.dirname(filename)
-                    include_file = os.path.normpath(
-                        os.path.join(dir, include_file))
-                print("Including %s" % include_file)
-                process_file(include_file)
-            else:
-                process_line(line)
+    try:
+        f = open(filename, "r")
+    except Exception:
+        error("Unable to open file %s" % filename)
+    for line in f.readlines():
+        line = line.split('#')[0] # ensure we discard the comments
+        line = line.strip()
+        if len(line) == 0 or line[0] == '#':
+            continue
+        a = shlex.split(line)
+        if a[0] == "include" and len(a) > 1:
+            include_file = a[1]
+            if include_file[0] != '/':
+                dir = os.path.dirname(filename)
+                include_file = os.path.normpath(
+                    os.path.join(dir, include_file))
+            print("Including %s" % include_file)
+            process_file(include_file)
+        else:
+            process_line(line)
 
 def add_apperiph_defaults(f):
     '''add default defines for peripherals'''
@@ -2261,7 +2260,11 @@ def add_apperiph_defaults(f):
             
 
 # process input file
-process_file(args.hwdef,args.extra_hwdef)
+if args.hwdef != None:
+    for filename in [args.hwdef,args.extra_hwdef]:
+        process_file(filename)
+else:
+    process_file(args.hwdef)
 
 outdir = args.outdir
 if outdir is None: