mm/hugetlb.c: make vma_has_reserves() return bool

This makes vma_has_reserves() return bool due to this particular function
only returning either one or zero as its return value.
Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -616,7 +616,7 @@ void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 }
 
 /* Returns true if the VMA has associated reserve pages */
-static int vma_has_reserves(struct vm_area_struct *vma, long chg)
+static bool vma_has_reserves(struct vm_area_struct *vma, long chg)
 {
 	if (vma->vm_flags & VM_NORESERVE) {
 		/*
@@ -629,23 +629,23 @@ static int vma_has_reserves(struct vm_area_struct *vma, long chg)
 		 * properly, so add work-around here.
 		 */
 		if (vma->vm_flags & VM_MAYSHARE && chg == 0)
-			return 1;
+			return true;
 		else
-			return 0;
+			return false;
 	}
 
 	/* Shared mappings always use reserves */
 	if (vma->vm_flags & VM_MAYSHARE)
-		return 1;
+		return true;
 
 	/*
 	 * Only the process that called mmap() has reserves for
 	 * private mappings.
 	 */
 	if (is_vma_resv_set(vma, HPAGE_RESV_OWNER))
-		return 1;
+		return true;
 
-	return 0;
+	return false;
 }
 
 static void enqueue_huge_page(struct hstate *h, struct page *page)