The recently introduced fix for the G=0 term of the deformation potential at 
q=0 had turned a complex variable into a real one. While likely harmless, it
isn't justified. Moreover the same variable was in the case of PAW not only
complex but also local and potentially undefined in the calling routine.


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11040 c92efa57-630b-4861-b058-cf58834340f0