score: fix dereference of NULL pointer in local_flush_tlb_page()

Don't dereference vma if it's NULL.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/score/mm/tlb-score.c

@@ -158,7 +158,7 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
 
 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 {
-	if (!vma || vma->vm_mm->context != 0) {
+	if (vma && vma->vm_mm->context != 0) {
 		unsigned long flags;
 		int oldpid, newpid, idx;
 		unsigned long vma_ASID = vma->vm_mm->context;