Unitialized Values in record_image_cmp

Hi,

Valgrind tells me:
==442828== Conditional jump or move depends on uninitialised value(s)
==442828==    at 0x80084F: record_image_cmp (rowtypes.c:1521)
==442828==    by 0x801522: btrecordimagecmp (rowtypes.c:1839)
==442828==    by 0x8C6604: comparison_shim (sortsupport.c:53)
==442828==    by 0x64284D: ApplySortComparator (sortsupport.h:143)
==442828==    by 0x642F3B: MJCompare (nodeMergejoin.c:412)
==442828==    by 0x643A29: ExecMergeJoin (nodeMergejoin.c:1211)
==442828==    by 0x62305A: ExecProcNode (execProcnode.c:453)
==442828==    by 0x640800: ExecLimit (nodeLimit.c:91)
==442828==    by 0x623135: ExecProcNode (execProcnode.c:500)
==442828==    by 0x620E15: ExecutePlan (execMain.c:1472)
==442828==    by 0x61EF94: standard_ExecutorRun (execMain.c:307)
==442828==    by 0x61EE0B: ExecutorRun (execMain.c:255)

And a quick look indeed seems to confirm that that's possible.

Greetings,

Andres Freund

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