Get rid of unused variables in state_point.F90. Also remove unnecessary null() initializations.
Get rid of unused variables in state_point.F90. Also remove unnecessary null()
initializations.

shikhar413/openmc,shikhar413/openmc,mit-crpg/openmc,smharper/openmc,walshjon/openmc,samuelshaner/openmc,samuelshaner/openmc,kellyrowland/openmc,johnnyliu27/openmc,samuelshaner/openmc,mit-crpg/openmc,mit-crpg/openmc,wbinventor/openmc,johnnyliu27/openmc,lilulu/openmc,wbinventor/openmc,paulromano/openmc,smharper/openmc,liangjg/openmc,mjlong/openmc,wbinventor/openmc,paulromano/openmc,johnnyliu27/openmc,johnnyliu27/openmc,bhermanmit/openmc,shikhar413/openmc,mit-crpg/openmc,bhermanmit/openmc,liangjg/openmc,walshjon/openmc,paulromano/openmc,smharper/openmc,liangjg/openmc,paulromano/openmc,kellyrowland/openmc,amandalund/openmc,walshjon/openmc,lilulu/openmc,smharper/openmc,shikhar413/openmc,samuelshaner/openmc,walshjon/openmc,liangjg/openmc,amandalund/openmc,mjlong/openmc,wbinventor/openmc,amandalund/openmc,amandalund/openmc,lilulu/openmc