mtd: mtd_oobtest: Remove redundant assignment to err

Variable err is set to zero but this value is never read as it is
overwritten with a new value later on, hence it is a redundant
assignment and can be removed.

Cleans up the following clang-analyzer warning:

drivers/mtd/tests/oobtest.c:626:4: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

drivers/mtd/tests/oobtest.c:603:4: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

drivers/mtd/tests/oobtest.c:579:4: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

drivers/mtd/tests/oobtest.c:556:4: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

drivers/mtd/tests/oobtest.c:532:3: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

drivers/mtd/tests/oobtest.c:509:3: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/tests/oobtest.c

···
 	err = mtd_write_oob(mtd, addr0, &ops);
 	if (err) {
 		pr_info("error occurred as expected\n");
-		err = 0;
 	} else {
 		pr_err("error: can write past end of OOB\n");
 		errcnt += 1;
···
 
 	if (err) {
 		pr_info("error occurred as expected\n");
-		err = 0;
 	} else {
 		pr_err("error: can read past end of OOB\n");
 		errcnt += 1;
···
 		err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
 		if (err) {
 			pr_info("error occurred as expected\n");
-			err = 0;
 		} else {
 			pr_err("error: wrote past end of device\n");
 			errcnt += 1;
···
 
 		if (err) {
 			pr_info("error occurred as expected\n");
-			err = 0;
 		} else {
 			pr_err("error: read past end of device\n");
 			errcnt += 1;
···
 		err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
 		if (err) {
 			pr_info("error occurred as expected\n");
-			err = 0;
 		} else {
 			pr_err("error: wrote past end of device\n");
 			errcnt += 1;
···
 
 		if (err) {
 			pr_info("error occurred as expected\n");
-			err = 0;
 		} else {
 			pr_err("error: read past end of device\n");
 			errcnt += 1;