mpt2sas: Fix typo in mpt2sas_config.c

Correct spelling "mappping" to "mapping"
in drivers/scsi/mpt2sas/mpt2sas_config.c

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/scsi/mpt2sas/mpt2sas_config.c b/drivers/scsi/mpt2sas/mpt2sas_config.c
index 36ea0b2..2b4d376 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -149,7 +149,7 @@
 			desc = "raid_config";
 			break;
 		case MPI2_CONFIG_EXTPAGETYPE_DRIVER_MAPPING:
-			desc = "driver_mappping";
+			desc = "driver_mapping";
 			break;
 		}
 		break;