Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 15d323b..4343aba 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -272,7 +272,7 @@
 	 * D- and monitor/CI channel are not enabled
 	 * STIO1 is used as output for data, B1+B2 from ST->IOM+HFC
 	 * STIO2 is used as data input, B1+B2 from IOM->ST
-	 * ST B-channel send disabled -> continous 1s
+	 * ST B-channel send disabled -> continuous 1s
 	 * The IOM slots are always enabled
 	 */
 	if (test_bit(HFC_CFG_PCM, &hc->cfg)) {