mtd: mtd_nandecctest: make module_init() return an error code if test fails

Return an error code if test fails in order to detect a test case failure
by invoking tests repeatedly like this:

while sudo modprobe mtd_nandecctest; do
	sudo modprobe -r mtd_nandecctest
done
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/tests/mtd_nandecctest.c

@@ -66,10 +66,13 @@ static int nand_ecc_test(const size_t size)
 
 static int __init ecc_test_init(void)
 {
-	nand_ecc_test(256);
-	nand_ecc_test(512);
+	int err;
 
-	return 0;
+	err = nand_ecc_test(256);
+	if (err)
+		return err;
+
+	return nand_ecc_test(512);
 }
 
 static void __exit ecc_test_exit(void)