tools/memory-model: Fix scripting --jobs argument

The parseargs.sh regular expression for the --jobs argument incorrectly
requires that the number of jobs be at least 10, that is, have at least
two digits.  This commit therefore adjusts this regular expression to
allow single-digit numbers of jobs to be specified.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/memory-model/scripts/parseargs.sh

@@ -113,7 +113,7 @@ do
 		LKMM_JOBS="`echo $njobs | sed -e 's/^\([0-9]\+\).*$/\1/'`"
 		;;
 	--jobs|--job|-j)
-		checkarg --jobs "(number)" "$#" "$2" '^[1-9][0-9]\+$' '^--'
+		checkarg --jobs "(number)" "$#" "$2" '^[1-9][0-9]*$' '^--'
 		LKMM_JOBS="$2"
 		shift
 		;;