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/[e-mail]
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/sr_ioctl.c

···
 			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 */