nlinv.c: free nufft_op
nlinv.c: free nufft_op

mrirecon/bart,sidward/bart,mrirecon/bart,sidward/bart,sidward/bart,sidward/bart,sdimoudi/bart,sdimoudi/bart,sdimoudi/bart,sdimoudi/bart,mrirecon/bart,sdimoudi/bart,sidward/bart,mrirecon/bart,mrirecon/bart