s390/mm: mmap base does not depend on ADDR_NO_RANDOMIZE personality

randomize_stack_top() checks for current task flag PF_RANDOMIZE in order
to use stack randomization and PF_RANDOMIZE is set when
ADDR_NO_RANDOMIZE is unset, so no need to check for ADDR_NO_RANDOMIZE
in stack_maxrandom_size.

[heiko.carstens@de.ibm.com]: See also commit 01578e36 ("x86/elf:
Remove the unnecessary ADDR_NO_RANDOMIZE checks")
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

arch/s390/mm/mmap.c

@@ -24,8 +24,6 @@ static unsigned long stack_maxrandom_size(void)
 {
 	if (!(current->flags & PF_RANDOMIZE))
 		return 0;
-	if (current->personality & ADDR_NO_RANDOMIZE)
-		return 0;
 	return STACK_RND_MASK << PAGE_SHIFT;
 }