Simplify file extension check.

Tools/px4params/scanner.py

@@ -8,20 +8,15 @@ class Scanner(object):
     to the Parser.
     """
 
-    re_file_extension = re.compile(r'\.([^\.]+)$')
-
     def ScanDir(self, srcdir, parser):
         """
         Scans provided path and passes all found contents to the parser using
         parser.Parse method.
         """
-        extensions = set(parser.GetSupportedExtensions())
+        extensions = tuple(parser.GetSupportedExtensions())
         for dirname, dirnames, filenames in os.walk(srcdir):
             for filename in filenames:
-                m = self.re_file_extension.search(filename)
-                if m:
-                    ext = m.group(1)
-                    if ext in extensions:
+                if filename.endswith(extensions):
                         path = os.path.join(dirname, filename)
                         self.ScanFile(path, parser)