fsl/utils.py: fix error from InvWarp generated filename
fsl/utils.py: fix error from InvWarp generated filename

wanderine/nipype,pearsonlab/nipype,carolFrohlich/nipype,sgiavasis/nipype,arokem/nipype,iglpdc/nipype,gerddie/nipype,Leoniela/nipype,Leoniela/nipype,grlee77/nipype,carlohamalainen/nipype,mick-d/nipype,FCP-INDI/nipype,rameshvs/nipype,dmordom/nipype,dgellis90/nipype,gerddie/nipype,dmordom/nipype,JohnGriffiths/nipype,dmordom/nipype,blakedewey/nipype,wanderine/nipype,dgellis90/nipype,iglpdc/nipype,grlee77/nipype,iglpdc/nipype,sgiavasis/nipype,wanderine/nipype,sgiavasis/nipype,fprados/nipype,FCP-INDI/nipype,glatard/nipype,arokem/nipype,JohnGriffiths/nipype,rameshvs/nipype,mick-d/nipype,fprados/nipype,pearsonlab/nipype,gerddie/nipype,JohnGriffiths/nipype,carolFrohlich/nipype,blakedewey/nipype,pearsonlab/nipype,mick-d/nipype_source,wanderine/nipype,glatard/nipype,JohnGriffiths/nipype,dgellis90/nipype,mick-d/nipype,mick-d/nipype_source,glatard/nipype,gerddie/nipype,rameshvs/nipype,blakedewey/nipype,arokem/nipype,arokem/nipype,dgellis90/nipype,blakedewey/nipype,carolFrohlich/nipype,grlee77/nipype,rameshvs/nipype,grlee77/nipype,Leoniela/nipype,FCP-INDI/nipype,sgiavasis/nipype,iglpdc/nipype,mick-d/nipype,carolFrohlich/nipype,fprados/nipype,mick-d/nipype_source,carlohamalainen/nipype,pearsonlab/nipype,carlohamalainen/nipype,FCP-INDI/nipype,glatard/nipype