init.d/vz: fix check_kernel() function

After commit 682aab717a7758f2e316976490cd3e8f7ec3feb2

[..]
       if ! [ test -d /proc/vz ]; then
[...]

-> bash error: [: -d: binary operator expected

Can be : (prefered)
       if ! test -d /proc/vz ; then
or:
       if [ ! -d /proc/vz ]; then
1 file changed