multiple potentially uninitialized local variable 'tmp' used in matrix operations

[diablodale]

In matrix processing, multiple locations of potentially uninitialized local variable 'tmp' used.

min-api/include/c74_min_operator_matrix.h

Line 299 in 63bd985

const std::array<U, 1> out_cell = self->m_min_object.calc_cell(tmp, info, position);

and lines 383 and 408.
Fixes can be to refactor code to be cleaner logic, set pragma's before these troublesome lines, etc.

Min appears to still be in flux, so correcting warnings are useful to continue a move towards stable clean code.