examples/hip/vector_add.py runs successfully on AMD

Author: Milo Lurati

kernel_tuner/backends/hip.py

@@ -129,7 +129,7 @@ def ready_argument_list(self, arguments):
         logging.debug("HipFunction ready_argument_list called")
         ctype_args = []
         data_ctypes = None
-        for arg in enumerate(arguments):
+        for arg in arguments:
             dtype_str = str(arg.dtype)
             if isinstance(arg, np.ndarray):
                 if dtype_str in dtype_map.keys():