Fixed typo

Author: elinscott

tests/helpers/patches/_check.py

@@ -349,9 +349,9 @@ def _run(self):
             for k in self.inputs.model_fields:
                 utils.warn(f'Input {k} differs')
                 for x in getattr(self.inputs, k):
-                    utils.warn(f'input {k}: ', x)
+                    utils.warn(f'input {k}: {x}')
                 for x in getattr(bench_process.inputs, k):
-                    utils.warn(f'bench {k}: ', x)
+                    utils.warn(f'bench {k}: {x}')
             raise ValueError()
 
         unpatched_run(self)