lazy-pages: rename update_lazy_iovs to drop_lazy_iovs

The function essentially drops a memory range from lazy IOVecs

travis-ci: success for lazy-pages: add non-#PF events handling (rev2)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/uffd.c

@@ -331,7 +331,7 @@ static struct lazy_iov *find_lazy_iov(struct lazy_pages_info *lpi,
  * Purge range (addr, addr + len) from lazy_iovs. The range may
  * cover several continuous IOVs.
  */
-static int update_lazy_iovs(struct lazy_pages_info *lpi, unsigned long addr,
+static int drop_lazy_iovs(struct lazy_pages_info *lpi, unsigned long addr,
 			  int len)
 {
 	struct lazy_iov *iov, *n;
@@ -575,7 +575,7 @@ static int complete_page_fault(struct lazy_pages_info *lpi, unsigned long vaddr,
 		}
 	}
 
-	return update_lazy_iovs(lpi, vaddr, nr * PAGE_SIZE);
+	return drop_lazy_iovs(lpi, vaddr, nr * PAGE_SIZE);
 }
 
 static int uffd_io_complete(struct page_read *pr, unsigned long vaddr, int nr)