mtd: nftlcore: remove set but rewrite variables

The value of lastEUN is not used at line 622, and will rewrite a new value
at line 541. so just remote the line at 622.

Signed-off-by: Tian Tao <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/nftlcore.c

···
 				return BLOCK_NIL;
 			}
 			//printk("Restarting scan\n");
-			lastEUN = BLOCK_NIL;
 			continue;
 		}