pgsql: Fix possible division by zero in pg_xlogdump.

Fix possible division by zero in pg_xlogdump.

When displaying stats it was possible that a floating point division by
zero occured when no FPIs were issued for a type of record.

Author: Abhijit Menon-Sen
Discussion: 20150417091811.GA14008@toroid.org

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9fe1d9ac6820cff354a5402114b96dae1221eba3

Modified Files
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src/bin/pg_xlogdump/pg_xlogdump.c | 53 ++++++++++++++++++++++++++-----------
1 file changed, 38 insertions(+), 15 deletions(-)

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