[CMake] ctest_update return value is incorrect when update failed

[Fedor Gusev]

Hello.

In CTest documentation it says that ctest_update returns -1 when update
failed: The RETURN_VALUE option specifies a variable in which to store the
result, which is the number of files updated or -1 on error. (see
http://www.cmake.org/cmake/help/v2.8.11/ctest.html#command:ctest_update)

I've noticed it is not true -- zero is returned instead. Attached patch
fixes this issue.
-- 
Kind regards,
Fedor Gusev.
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