pgsql: Silence compiler warning

Silence compiler warning

Caused by the backpatch of f650882 past the point where interrupt
handling was changed.

Noted by Dean Rasheed

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/f832a1e9e9a889c1c08a60db5520327bc0569fd6

Modified Files
--------------
src/backend/replication/basebackup.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

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