scsi: sr: Fix spelling mistake "does'nt" -> "doesn't"

There is a spelling mistake in a literal string. Fix it.

Link: https://lore.kernel.org/r/20210826115714.11844-1-colin.king@canonical.comSigned-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sr_ioctl.c

@@ -523,7 +523,7 @@ static int sr_read_sector(Scsi_CD *cd, int lba, int blksize, unsigned char *dest
 			return rc;
 		cd->readcd_known = 0;
 		sr_printk(KERN_INFO, cd,
-			  "CDROM does'nt support READ CD (0xbe) command\n");
+			  "CDROM doesn't support READ CD (0xbe) command\n");
 		/* fall & retry the other way */
 	}
 	/* ... if this fails, we switch the blocksize using MODE SELECT */