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sql: fix port_c_get_vdbemem() MP_INT usage

The function is used to build a mem from msgpack returned by a C
function via port_c. To use in some operation, like a comparison
or arithmetics.

It used to treat MP_INT as an always negative value, which
could result into those operations having invalid results or even
failing assertions in debug build.

Lets check the MP_INT sign before assigning the mem type.

Closes #10132

NO_DOC=bugfix

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