MFC r335069-r335071, r335110, r335116: stand housecleaning

r335069:
Remove fail: label. It's unused.

r335070:
Remove unused variables.

[kevans@: removed ufs.c modifications; those depend on ufs rewrite bits]

r335071:
Initialize variables we later free so they aren't used
uninitialized in the error path.
Remove unused variables.

r335110:
Remove redundant defs.mk includes. They aren't needed.

r335116:
Use bool for vargood, since it's a boolean.