Add a few simple error checks to tlb dumper.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/lib-32/dump_tlb.c

@@ -160,16 +160,17 @@ void dump_list_process(struct task_struct *t, void *address)
 
 	if (addr > KSEG0)
 		page_dir = pgd_offset_k(0);
-	else
+	else if (t->mm) {
 		page_dir = pgd_offset(t->mm, 0);
 		printk("page_dir == %08x\n", (unsigned int) page_dir);
+	} else
+		printk("Current thread has no mm\n");
 
 	if (addr > KSEG0)
 		pgd = pgd_offset_k(addr);
-	else
+	else if (t->mm) {
 		pgd = pgd_offset(t->mm, addr);
 		printk("pgd == %08x, ", (unsigned int) pgd);
-
 		pud = pud_offset(pgd, addr);
 		printk("pud == %08x, ", (unsigned int) pud);
 
@@ -178,6 +179,8 @@ void dump_list_process(struct task_struct *t, void *address)
 
 		pte = pte_offset(pmd, addr);
 		printk("pte == %08x, ", (unsigned int) pte);
+	} else
+		printk("Current thread has no mm\n");
 
 	page = *pte;
 #ifdef CONFIG_64BIT_PHYS_ADDR