pgsql: Fix unportable usage of isspace().

Fix unportable usage of isspace().

Must cast char argument to unsigned to avoid doing the wrong thing
with high-bit-set characters. Oversight in commit
30b5ede7157e34e77c7914b8ecfd55aa8da6edc3.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a149d8bd56edc2f06643118ed8aac8bce6ebad6d

Modified Files
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src/bin/pg_basebackup/pg_basebackup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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