FIX: LGTM warning: Variable defined multiple times

This assignment to 'patient_info' is unnecessary as it is redefined here before this value is used.

https://lgtm.com/rules/1800095/

Author: DimitriPapadopoulos

nibabel/cmdline/dicomfs.py

@@ -71,7 +71,7 @@ def get_paths(self):
         for study in dft.get_studies(self.dicom_path, self.followlinks):
             pd = paths.setdefault(study.patient_name_or_uid(), {})
             patient_info = 'patient information\n'
-            patient_info = f'name: {study.patient_name}\n'
+            patient_info += f'name: {study.patient_name}\n'
             patient_info += f'ID: {study.patient_id}\n'
             patient_info += f'birth date: {study.patient_birth_date}\n'
             patient_info += f'sex: {study.patient_sex}\n'