mkdtboimg: Sanitize dt filename am: 4b929c464b

Original change: https://android-review.googlesource.com/c/platform/system/libufdt/+/1410171

Change-Id: Ibd7ff1ef1e7c0e7fa7b727c92c8d8c74cebcf366
diff --git a/utils/src/mkdtboimg.py b/utils/src/mkdtboimg.py
index 136543f..614e582 100755
--- a/utils/src/mkdtboimg.py
+++ b/utils/src/mkdtboimg.py
@@ -900,7 +900,7 @@
         filepath = dt_arg['filename']
         if not os.path.isabs(filepath):
             for root, dirnames, filenames in os.walk(args.dtbdir):
-                for filename in fnmatch.filter(filenames, filepath):
+                for filename in fnmatch.filter(filenames, os.path.basename(filepath)):
                     filepath = os.path.join(root, filename)
         params['dt_file'] = open(filepath, 'rb')
         params['dt_offset'] = 0