pgsql: Be more wary of unwanted whitespace in pgstat_reset_remove_files

Be more wary of unwanted whitespace in pgstat_reset_remove_files().

sscanf isn't the easiest thing to use for exact pattern checks ...
also, don't use strncmp where strcmp will do.

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/59bc4a43ec588d25fe976774bd1194f1b90251fa

Modified Files
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src/backend/postmaster/pgstat.c | 30 ++++++++++++++----------------
1 file changed, 14 insertions(+), 16 deletions(-)

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