fix nil panic #19819
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fix nil panic #19819
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What type of PR is this?
Which issue(s) this PR fixes:
issue ##19764
What this PR does / why we need it:
原因：parseStmtExecute可能返回error了。导致prepareStmt为nil. 从prepareStmt取值放到了err判断之前。
修改：从prepareStmt取值放到了err判断之后。