Added missing initialization of lapw%nv in eigen.F90.

The problem is that this array has size 2 and in hsmt_nonsph the maximum
value of this array is used for some array allocation. If the system under
investigation only has a single spin the 2nd value is undefined.

(found with valgrind, only theoretical error source so far)

eigen/eigen.F90

@@ -453,7 +453,7 @@ CONTAINS
           !--->         set up lapw list
           !
           CALL timestart("Setup of LAPW")
-          lapw%rk = 0 ; lapw%k1 = 0 ; lapw%k2 = 0 ; lapw%k3 = 0
+          lapw%rk = 0 ; lapw%k1 = 0 ; lapw%k2 = 0 ; lapw%k3 = 0 ; lapw%nv = 0
           CALL apws(DIMENSION,input,noco, kpts,nk,cell,l_zref, mpi%n_size,jsp, bkpt,lapw,matind,nred)
 
           CALL timestop("Setup of LAPW")