mtd: tests: Remove redundant assignment to err

Variable 'err' is set to 0 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/torturetest.c:233:2: warning: Value stored to 'err' is
never read [clang-analyzer-deadcode.DeadStores]

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

drivers/mtd/tests/torturetest.c

···
 	if (!bad_ebs)
 		goto out_check_buf;
 
-	err = 0;
-
 	/* Initialize patterns */
 	memset(patt_FF, 0xFF, mtd->erasesize);
 	for (i = 0; i < mtd->erasesize / pgsize; i++) {