From: Wei Yang <richardw.yang@linux.intel.com>

When one is equal or bigger then end, it means there is no page to
discard. Just break the loop in this case instead of processing it.

No functional change, just refactor it a little.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190627020822.15485-3-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/ram.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 68bc11c9e7..8a97dadec4 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2864,23 +2864,23 @@ static int postcopy_send_discard_bm_ram(MigrationState *ms,
 
     for (current = 0; current < end; ) {
         unsigned long one = find_next_bit(unsentmap, end, current);
+        unsigned long zero, discard_length;
 
-        if (one < end) {
-            unsigned long zero = find_next_zero_bit(unsentmap, end, one + 1);
-            unsigned long discard_length;
+        if (one >= end) {
+            break;
+        }
 
-            if (zero >= end) {
-                discard_length = end - one;
-            } else {
-                discard_length = zero - one;
-            }
-            if (discard_length) {
-                postcopy_discard_send_range(ms, pds, one, discard_length);
-            }
-            current = one + discard_length;
+        zero = find_next_zero_bit(unsentmap, end, one + 1);
+
+        if (zero >= end) {
+            discard_length = end - one;
         } else {
-            current = one;
+            discard_length = zero - one;
+        }
+        if (discard_length) {
+            postcopy_discard_send_range(ms, pds, one, discard_length);
         }
+        current = one + discard_length;
     }
 
     return 0;
-- 
2.21.0