cifs: suppress some implicit-fallthrough warnings

To avoid the warning:

     warning: this statement may fall through [-Wimplicit-fallthrough=]
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NSteve French <stfrench@microsoft.com>

fs/cifs/connect.c

@@ -1828,7 +1828,7 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
 				vol->password = NULL;
 				break;
 			}
-			/* Yes it is. Drop down to Opt_pass below.*/
+			/* Fallthrough - to Opt_pass below.*/
 		case Opt_pass:
 			/* Obtain the value string */
 			value = strchr(data, '=');

fs/cifs/sess.c

@@ -534,9 +534,9 @@ cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 			if (global_secflags & CIFSSEC_MAY_NTLM)
 				return NTLM;
 		default:
-			/* Fallthrough to attempt LANMAN authentication next */
 			break;
 		}
+		/* Fallthrough - to attempt LANMAN authentication next */
 	case CIFS_NEGFLAVOR_LANMAN:
 		switch (requested) {
 		case LANMAN: