BUG_ON() Conversion in mm/mmap.c

this changes if() BUG(); constructs to BUG_ON() which is
cleaner, contains unlikely() and can better optimized away.
Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

mm/mmap.c

@@ -294,8 +294,7 @@ void validate_mm(struct mm_struct *mm)
 	i = browse_rb(&mm->mm_rb);
 	if (i != mm->map_count)
 		printk("map_count %d rb %d\n", mm->map_count, i), bug = 1;
-	if (bug)
-		BUG();
+	BUG_ON(bug);
 }
 #else
 #define validate_mm(mm) do { } while (0)
@@ -432,8 +431,7 @@ __insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma)
 	struct rb_node ** rb_link, * rb_parent;
 
 	__vma = find_vma_prepare(mm, vma->vm_start,&prev, &rb_link, &rb_parent);
-	if (__vma && __vma->vm_start < vma->vm_end)
-		BUG();
+	BUG_ON(__vma && __vma->vm_start < vma->vm_end);
 	__vma_link(mm, vma, prev, rb_link, rb_parent);
 	mm->map_count++;
 }
@@ -813,8 +811,7 @@ struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma)
 	 * (e.g. stash info in next's anon_vma_node when assigning
 	 * an anon_vma, or when trying vma_merge).  Another time.
 	 */
-	if (find_vma_prev(vma->vm_mm, vma->vm_start, &near) != vma)
-		BUG();
+	BUG_ON(find_vma_prev(vma->vm_mm, vma->vm_start, &near) != vma);
 	if (!near)
 		goto none;