Monotonic flag sets incorrectly in rangelib

After applying update_target_files_incr_ext4.sh, some files may end up
occupying unsorted block fragments. In one example, an apk file has the
block range [258768-259211,196604]. The monotonic flag in rangelib sets
incorrectly for this example and leads to a bad input file for imgdiff.
After fixing the flag, bsdiff is called instead of imgdiff and the
incremental OTA package generates successfully.

Bug:28053885
Change-Id: Ib841bf449ff6a29314fc4a1b8fba941a6dc532ac
diff --git a/tools/releasetools/rangelib.py b/tools/releasetools/rangelib.py
index 31ed83a..1638f8c 100644
--- a/tools/releasetools/rangelib.py
+++ b/tools/releasetools/rangelib.py
@@ -104,7 +104,7 @@
         if last <= s:
           last = s+1
         else:
-          monotonic = True
+          monotonic = False
     data.sort()
     self.data = tuple(self._remove_pairs(data))
     self.monotonic = monotonic