mi_cmd_var_create cleanups

[Vladimir Prus]

The mi_cmd_var_create seem to use cleanups in non-standard way. That does not 
cause any apparent problem, but still better fixed. Is the attached OK?

Tested on x86, no regressions.

- Volodya

	* mi/mi-cmd-var.c (mI_cmd_var_create): Fix cleanup
	handlers. Free expression.


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