s390: fix alloc_pgste check in init_new_context again

s390: fix alloc_pgste check in init_new_context again

git commit 843d26a9f74d "fix alloc_pgste check in init_new_context" fixed
the problem of 'current->mm == NULL' in init_new_context back in 2011.

git commit d013bb5778dd "KVM: s390: allow sie enablement for multi-
threaded programs" completely removed the check against alloc_pgste.

git commit c4ffa562d05d "s390/kvm: avoid global config of vm.alloc_pgste=1"
re-added a check against the alloc_pgste flag but without the required
check for current->mm != NULL.

For execve() called by a kernel thread init_new_context() reads from
((struct mm_struct *) NULL)->context.alloc_pgste to decide between
2K vs 4K page tables. If the bit happens to be set for the init process
it will be created with large page tables. This decision is inherited by
all the children of init, this waste quite some memory.

Re-add the check for 'current->mm != NULL'.

Fixes: c4ffa562d05d ("s390/kvm: avoid global config of vm.alloc_pgste=1")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>