Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/scsi/sym53c416.c b/drivers/scsi/sym53c416.c
index 190107a..012c86e 100644
--- a/drivers/scsi/sym53c416.c
+++ b/drivers/scsi/sym53c416.c
@@ -774,7 +774,7 @@
 
 	/* printk("sym53c416_reset\n"); */
 	base = SCpnt->device->host->io_port;
-	/* search scsi_id - fixme, we shouldnt need to iterate for this! */
+	/* search scsi_id - fixme, we shouldn't need to iterate for this! */
 	for(i = 0; i < host_index && scsi_id == -1; i++)
 		if(hosts[i].base == base)
 			scsi_id = hosts[i].scsi_id;