Re: trying again to get incremental backup

My compiler has the following complaint:

../postgresql/src/backend/postmaster/walsummarizer.c: In function ‘GetOldestUnsummarizedLSN’:
../postgresql/src/backend/postmaster/walsummarizer.c:540:32: error: ‘unsummarized_lsn’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  540 |  WalSummarizerCtl->pending_lsn = unsummarized_lsn;
      |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~

I haven't looked closely to see whether there is actually a problem here,
but the attached patch at least resolves the warning.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com