[mi] kill release_value calls

[Vladimir Prus]

This patch removes all calls to release_value in varobj.c, except
for one. We only need to call release_value when we're storing
a value for indefinite future use, and install_new_value is the
only such place.  The extra release_value calls either 
are time-consuming no-ops, or lead to memory leaks, 
depending on the value type.

OK?

- Volodya

	* varobj.c (c_value_of_root, c_value_of_child)
	(cplus_value_of_child): Don't call release_value.

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