Commit89a94c2

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Don't call fwrite() with len == 0 when writing out relcache init file.

Noticed via -fsanitize=undefined.Backpatch to all branches, for the same reasons as46ab07f.Discussion:https://postgr.es/m/20220323173537.ll7klrglnp4gn2um@alap3.anarazel.deBackpatch: 10-

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Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -6485,7 +6485,7 @@ write_item(const void data, Size len, FILE fp)`
`6485`	`6485`	`{`
`6486`	`6486`	`if (fwrite(&len,1,sizeof(len),fp)!=sizeof(len))`
`6487`	`6487`	`elog(FATAL,"could not write init file");`
`6488`		`-if (fwrite(data,1,len,fp)!=len)`
	`6488`	`+if (len>0&&fwrite(data,1,len,fp)!=len)`
`6489`	`6489`	`elog(FATAL,"could not write init file");`
`6490`	`6490`	`}`
`6491`	`6491`

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