s390/vdso: remove superfluous check

vdso_pages (aka vdso64_pages) is never 0, therefore remove the check.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/vdso.c

@@ -118,13 +118,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 		return 0;
 
 	vdso_pages = vdso64_pages;
-	/*
-	 * vDSO has a problem and was disabled, just don't "enable" it for
-	 * the process
-	 */
-	if (vdso_pages == 0)
-		return 0;
-
 	/*
 	 * pick a base address for the vDSO in process space. We try to put
 	 * it at vdso_base which is the "natural" base for it, but we might