pgsql: Free walmethods before exiting

Free walmethods before exiting

Not strictly necessary since we quite after, but could become important
in the future if we do restarts etc.

Michael Paquier with nitpicking from me

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/78d109150bf133c38bcdc6d8c5bd9ff546ed1171

Modified Files
--------------
src/bin/pg_basebackup/pg_basebackup.c | 7 +++++++
src/bin/pg_basebackup/pg_receivexlog.c | 4 ++++
src/bin/pg_basebackup/walmethods.c | 18 ++++++++++++++++++
src/bin/pg_basebackup/walmethods.h | 4 ++++
4 files changed, 33 insertions(+)

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