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/mISDN/layer2.c b/drivers/isdn/mISDN/layer2.c
index 4ae7505..d0aeb44 100644
--- a/drivers/isdn/mISDN/layer2.c
+++ b/drivers/isdn/mISDN/layer2.c
@@ -1864,7 +1864,7 @@
 		psapi >>= 2;
 		ptei >>= 1;
 		if (psapi != l2->sapi) {
-			/* not our bussiness */
+			/* not our business */
 			if (*debug & DEBUG_L2)
 				printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n",
 					__func__, psapi, l2->sapi);
@@ -1872,7 +1872,7 @@
 			return 0;
 		}
 		if ((ptei != l2->tei) && (ptei != GROUP_TEI)) {
-			/* not our bussiness */
+			/* not our business */
 			if (*debug & DEBUG_L2)
 				printk(KERN_DEBUG "%s: tei %d/%d mismatch\n",
 					__func__, ptei, l2->tei);