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A minor simplification for List manipulation

Fix one place that was using lfirst(list_head(list)) by using linitial(list)instead. They are equivalent but the latter is simpler. We did the same in9d299a4.Author: Richard Guo <guofenglinux@gmail.com>Discussion:https://www.postgresql.org/message-id/flat/CAMbWs49dJnpezDQDDxCPKq7+=_3NyqLqGqnhqCjd+dYe4MS15w@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -523,7 +523,7 @@ rewriteSearchAndCycle(CommonTableExpr *cte)`
`523`	`523`
`524`	`524`	`fexpr=makeFuncExpr(F_INT8INC,INT8OID,list_make1(fs),InvalidOid,InvalidOid,COERCE_EXPLICIT_CALL);`
`525`	`525`
`526`		`-lfirst(list_head(search_col_rowexpr->args))=fexpr;`
	`526`	`+linitial(search_col_rowexpr->args)=fexpr;`
`527`	`527`
`528`	`528`	`texpr= (Expr*)search_col_rowexpr;`
`529`	`529`	`}`

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