Merge "releasetools: Fix one missing case for --oem_no_mount."

tools/releasetools/ota_from_target_files.py

@@ -1424,6 +1424,7 @@ def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
   if oem_props is not None and len(oem_props) > 0:
     if OPTIONS.oem_source is None:
       raise common.ExternalError("OEM source required for this build")
+    if not OPTIONS.oem_no_mount:
       script.Mount("/oem", recovery_mount_options)
     oem_dict = common.LoadDictionaryFromLines(
         open(OPTIONS.oem_source).readlines())