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/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index a860452..3df9853 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -295,7 +295,7 @@
 		rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
 		/*
 		 * We may not have been able to send data because the conn
-		 * is getting stopped. libiscsi will know so propogate err
+		 * is getting stopped. libiscsi will know so propagate err
 		 * for it to do the right thing.
 		 */
 		if (rc == -EAGAIN)