make useable for submodules

git ls-tree returnes `commit` entries for submodules. We remove them
from the output. Without this the script crashes with this trace:

    Traceback (most recent call last):
      File "./update.py", line 138, in <module>
        newBlobs = updateBlobIDs (tag)
      File "./update.py", line 46, in updateBlobIDs
        hash, filename = blob.split (b' ')
    ValueError: too many values to unpack (expected 2)

Signed-off-by: Silvio Fricke <[email protected]>

Author: silvio

script.sh

@@ -136,7 +136,7 @@ case $cmd in
 
         v=`echo $1 | version_rev`
         git ls-tree -r "$v" |
-        sed -r "s/^\S* blob (\S*)\t(([^/]*\/)*(.*))$/$format/"
+        sed -r "s/^\S* blob (\S*)\t(([^/]*\/)*(.*))$/$format/; /^\S* commit .*$/d"
         ;;
 
     tokenize-file)