mtd: style fixups in multi-line comment, indentation

#define MTD_FAIL_ADDR_UNKNOWN -1LL

/* If the erase fails, fail_addr might indicate exactly which block failed.  If

   fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level or was not

   specific to any particular block. */

/*

 * If the erase fails, fail_addr might indicate exactly which block failed. If

 * fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level

 * or was not specific to any particular block.

 */

struct erase_info {

	struct mtd_info *mtd;

	uint64_t addr;