UFileClose needs a return value.

[gongxun0928]

The close function may have an error and return a return value which less than 0, so UFileClose also needs a return value. The external system checks the return value to determine whether an error has occurred. If an error occurs, the error information is obtained through UFileGetLastError.

fix #ISSUE_Number

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[wenchaozhang-123]

Need also to change the fileam->close function return type?