Add explicit parentheses to silence warning
Add explicit parentheses to silence warning

refs #8328

backmari/moose,jessecarterMOOSE/moose,harterj/moose,SudiptaBiswas/moose,bwspenc/moose,backmari/moose,harterj/moose,dschwen/moose,harterj/moose,milljm/moose,lindsayad/moose,sapitts/moose,laagesen/moose,YaqiWang/moose,sapitts/moose,nuclear-wizard/moose,permcody/moose,lindsayad/moose,andrsd/moose,friedmud/moose,Chuban/moose,backmari/moose,dschwen/moose,milljm/moose,YaqiWang/moose,liuwenf/moose,dschwen/moose,permcody/moose,YaqiWang/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,stimpsonsg/moose,idaholab/moose,yipenggao/moose,liuwenf/moose,nuclear-wizard/moose,andrsd/moose,laagesen/moose,idaholab/moose,friedmud/moose,bwspenc/moose,milljm/moose,Chuban/moose,andrsd/moose,lindsayad/moose,permcody/moose,andrsd/moose,milljm/moose,jessecarterMOOSE/moose,milljm/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,liuwenf/moose,sapitts/moose,liuwenf/moose,SudiptaBiswas/moose,bwspenc/moose,stimpsonsg/moose,laagesen/moose,bwspenc/moose,Chuban/moose,andrsd/moose,dschwen/moose,liuwenf/moose,Chuban/moose,bwspenc/moose,harterj/moose,yipenggao/moose,SudiptaBiswas/moose,SudiptaBiswas/moose,idaholab/moose,backmari/moose,friedmud/moose,dschwen/moose,friedmud/moose,sapitts/moose,stimpsonsg/moose,idaholab/moose,lindsayad/moose,harterj/moose,yipenggao/moose,laagesen/moose,SudiptaBiswas/moose,permcody/moose,YaqiWang/moose,yipenggao/moose,sapitts/moose,lindsayad/moose,stimpsonsg/moose,idaholab/moose,jessecarterMOOSE/moose,liuwenf/moose,laagesen/moose