uspot: fix compile error in radius.c for older GCC

/openwrt/build_dir/target-arm_cortex-a7_musl_eabi/uspot/radius.c:264:4: error: label at end of compound statement
    default:
    ^
Signed-off-by: John Crispin <john@phrozen.org>

feeds/ucentral/uspot/src/radius.c

@@ -262,6 +262,7 @@ radius(void)
 			case RADIUS_PROXY_STATE_AUTH:
 				continue;	// ignore those keys
 			default:
+				break;
 		}
 
 		if (!tb[i])