Fix use of wrong and undef variable

Two of the ValueError exceptionsraised in get_base_for_testsuite() refer
to the wrong variable and an undefined variable respectively. This patch
fixes those.

Reviewed By: cmatthews

Differential Revision: https://reviews.llvm.org/D94663

Author: Thomas Preud'homme

lnt/server/db/migrations/upgrade_0_to_1.py

@@ -195,7 +195,7 @@ class Machine(UpdatedBase):
         for item in test_suite.machine_fields:
             if item.name in class_dict:
                 raise ValueError("test suite defines reserved key %r" %
-                                 (name,))
+                                 (item.name,))
 
             class_dict[item.name] = item.column = Column(
                 item.name, String(256))
@@ -268,7 +268,7 @@ class Sample(UpdatedBase):
         for item in test_suite.sample_fields:
             if item.name in class_dict:
                 raise ValueError("test suite defines reserved key {}"
-                                 .format(name))
+                                 .format(item.name))
 
             if item.type.name == 'Real':
                 item.column = Column(item.name, Float)