Add missing error check on tidyLoadConfig

Parse errors were not reported for the default config, they were only
reported when explicitly another config was loaded.
This means that us

Add missing error check on tidyLoadConfig

Parse errors were not reported for the default config, they were only
reported when explicitly another config was loaded.
This means that users may not be aware of errors in their configuration
and therefore the behaviour of Tidy might not be what they intended.
This patch fixes that issue by using a common function. In fact, the
check for -1 might be enough for the current implementation of Tidy, but
the Tidy docs say that any value other than 0 indicates an error.
So future errors might not be caught when just using an error code of -1.
Therefore, this also changes the error code checks of == -1 to < 0 and
== 1 to > 0.

Closes GH-10636

Signed-off-by: George Peter Banyard <girgias@php.net>

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