BUG: Remove valgrind reported leak
BUG: Remove valgrind reported leak

The MGHIO filter was leaking memory due to unnecessary
dynamic allocation variable.
The dynamic allocated variable was not being deleted.

Change-Id: I77cf2ea9bfe553121ae1fc89aa30a343a3c88ac4

BRAINSia/ITK,LucasGandel/ITK,malaterre/ITK,InsightSoftwareConsortium/ITK,hendradarwin/ITK,jcfr/ITK,msmolens/ITK,msmolens/ITK,stnava/ITK,thewtex/ITK,blowekamp/ITK,hjmjohnson/ITK,biotrump/ITK,BlueBrain/ITK,LucHermitte/ITK,hjmjohnson/ITK,hendradarwin/ITK,atsnyder/ITK,stnava/ITK,PlutoniumHeart/ITK,Kitware/ITK,LucasGandel/ITK,BlueBrain/ITK,ajjl/ITK,jcfr/ITK,thewtex/ITK,heimdali/ITK,richardbeare/ITK,LucasGandel/ITK,hjmjohnson/ITK,LucasGandel/ITK,fedral/ITK,hjmjohnson/ITK,spinicist/ITK,stnava/ITK,atsnyder/ITK,LucHermitte/ITK,LucasGandel/ITK,msmolens/ITK,jcfr/ITK,Kitware/ITK,spinicist/ITK,jcfr/ITK,fedral/ITK,thewtex/ITK,fedral/ITK,msmolens/ITK,richardbeare/ITK,richardbeare/ITK,PlutoniumHeart/ITK,hjmjohnson/ITK,hendradarwin/ITK,malaterre/ITK,msmolens/ITK,jmerkow/ITK,thewtex/ITK,heimdali/ITK,ajjl/ITK,jcfr/ITK,LucasGandel/ITK,PlutoniumHeart/ITK,richardbeare/ITK,stnava/ITK,biotrump/ITK,fedral/ITK,hendradarwin/ITK,jmerkow/ITK,BRAINSia/ITK,LucHermitte/ITK,vfonov/ITK,Kitware/ITK,jmerkow/ITK,fbudin69500/ITK,richardbeare/ITK,zachary-williamson/ITK,atsnyder/ITK,Kitware/ITK,ajjl/ITK,zachary-williamson/ITK,vfonov/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,spinicist/ITK,stnava/ITK,PlutoniumHeart/ITK,zachary-williamson/ITK,richardbeare/ITK,vfonov/ITK,BlueBrain/ITK,jmerkow/ITK,malaterre/ITK,jcfr/ITK,LucHermitte/ITK,stnava/ITK,biotrump/ITK,PlutoniumHeart/ITK,ajjl/ITK,thewtex/ITK,atsnyder/ITK,eile/ITK,hjmjohnson/ITK,fbudin69500/ITK,ajjl/ITK,malaterre/ITK,LucasGandel/ITK,blowekamp/ITK,PlutoniumHeart/ITK,malaterre/ITK,blowekamp/ITK,fbudin69500/ITK,BlueBrain/ITK,vfonov/ITK,fbudin69500/ITK,fedral/ITK,eile/ITK,atsnyder/ITK,PlutoniumHeart/ITK,hendradarwin/ITK,BlueBrain/ITK,malaterre/ITK,vfonov/ITK,BRAINSia/ITK,fedral/ITK,hendradarwin/ITK,zachary-williamson/ITK,LucHermitte/ITK,LucasGandel/ITK,malaterre/ITK,hendradarwin/ITK,BRAINSia/ITK,ajjl/ITK,LucHermitte/ITK,heimdali/ITK,blowekamp/ITK,fedral/ITK,fbudin69500/ITK,vfonov/ITK,thewtex/ITK,vfonov/ITK,eile/ITK,BlueBrain/ITK,jcfr/ITK,eile/ITK,atsnyder/ITK,stnava/ITK,biotrump/ITK,thewtex/ITK,msmolens/ITK,blowekamp/ITK,ajjl/ITK,biotrump/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,ajjl/ITK,heimdali/ITK,eile/ITK,vfonov/ITK,eile/ITK,InsightSoftwareConsortium/ITK,heimdali/ITK,malaterre/ITK,richardbeare/ITK,LucHermitte/ITK,heimdali/ITK,jmerkow/ITK,Kitware/ITK,jcfr/ITK,BRAINSia/ITK,eile/ITK,BRAINSia/ITK,eile/ITK,spinicist/ITK,zachary-williamson/ITK,jmerkow/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,atsnyder/ITK,atsnyder/ITK,zachary-williamson/ITK,stnava/ITK,Kitware/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,BlueBrain/ITK,heimdali/ITK,eile/ITK,heimdali/ITK,spinicist/ITK,hendradarwin/ITK,zachary-williamson/ITK,LucHermitte/ITK,fbudin69500/ITK,BRAINSia/ITK,blowekamp/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,fedral/ITK,zachary-williamson/ITK,blowekamp/ITK,msmolens/ITK,malaterre/ITK,vfonov/ITK,msmolens/ITK,atsnyder/ITK,spinicist/ITK,jmerkow/ITK,zachary-williamson/ITK,biotrump/ITK,fbudin69500/ITK,BlueBrain/ITK,spinicist/ITK,jmerkow/ITK,biotrump/ITK,biotrump/ITK,spinicist/ITK,hjmjohnson/ITK,PlutoniumHeart/ITK