mpi: Fix return value of mpi_invm_generic.
* mpi/mpi-inv.c (mpi_invm_generic): Return 0 if inverse does not exist.
Cherry-pick the master commit of:
	bc3b6a6a45cf9fa6cc0556da870628c53570f52f
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
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mpi: Fix return value of mpi_invm_generic. Tags None Subscribers None 
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