mkdir_tests.sh: Handle error message from mkdir from rust coreutils

mkdir from rust coreutils doesn't print the directory path. Account for
that.

Link: https://lore.kernel.org/ltp/[email protected]/
Reviewed-by: Petr Vorel <[email protected]>
Signed-off-by: Juerg Haefliger <[email protected]>

Author: Juerg Haefliger via ltp

testcases/commands/mkdir/mkdir_tests.sh

@@ -34,6 +34,9 @@ test2()
 
 	if grep -q "$LONG_PATH.*No such file or directory" mkdir.out; then
 		tst_res TPASS "Got correct error message"
+	elif grep -q "mkdir: No such file or directory" mkdir.out; then
+		# mkdir from rust coreutils doesn't print the directory path
+		tst_res TPASS "Got correct error message"
 	else
 		tst_res TFAIL "Got wrong error message"
 		cat mkdir.out