More carefully validate xlog location string inputs

Now that we have validate_xlog_location, call it from the previously
existing functions taking xlog locatoins as a string input.

Suggested by Fujii Masao

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/141b89826ddb82b3afa7cf5e048d28a3d8e1c45c

Modified Files
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src/backend/access/transam/xlogfuncs.c |    8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

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