Filter out tags/* branches that aren't revision numbers.

- Legacy-Id: 4708

test/mkdevbranch

@@ -28,7 +28,7 @@ function version() {
 #[ $1 -gt 70 ]  || die "Expected the ietf number as argument on the command line, but found '$1'"
 
 #if [ "$1" ]; then arg=$1; else arg=$(svn info http://svn.tools.ietf.org/svn/tools/ietfdb/trunk/ | egrep "^Last Changed Rev" | awk '{print $4}'); fi
-if [ "$1" ]; then arg=$1; else arg=$(svn ls http://svn.tools.ietf.org/svn/tools/ietfdb/tags/ | tail -n 1 | sed -r 's/^(.*)\/$/v\1/' ); fi
+if [ "$1" ]; then arg=$1; else arg=$(svn ls http://svn.tools.ietf.org/svn/tools/ietfdb/tags/ | egrep '^[0-9]' | tail -n 1 | sed -r 's/^(.*)\/$/v\1/' ); fi
 
 if [ "${arg:0:1}" = "v" ]; then
     source="tags/${arg:1}"