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Fix buffer pin leak in heap update redo routine.
In a heap update, if the old and new tuple were on different pages, and thenew page no longer existed (because it was subsequently truncated away byvacuum), heap_xlog_update forgot to release the pin on the old buffer. Thisbug was introduced by the "Fix multiple problems in WAL replay" patch,commit3bbf668 (on master branch).With full_page_writes=off, this triggered an "incorrect local pin count"error later in replay, if the old page was vacuumed.This fixes bug #7969, reported by Yunong Xiao. Backpatch to 9.0, like thecommit that introduced this bug.1 parent30de42d commitf4ecfbc
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