FIX: Changes .rsplit to os.path.splittext.

Author: David Ellis

nipype/interfaces/freesurfer/utils.py

@@ -1984,7 +1984,7 @@ def _format_arg(self, name, spec, value):
             basename = os.path.basename(value)
             # whent the -mgz flag is specified, it assumes the mgz extension
             if self.inputs.mgz:
-                prefix = basename.rstrip('.mgz')
+                prefix = os.path.splitext(basename)[0]
             else:
                 prefix = basename
             if prefix == 'aseg':