Fix build.sh

Change-Id: I7ae8915a7c190b2259b983f654c38d97b48ba2da
diff --git a/build.sh b/build.sh
index b5c78af..2529a7d 100755
--- a/build.sh
+++ b/build.sh
@@ -33,7 +33,8 @@
 				make clean
 				;;
 			*)
-				exit 1;;
+#				exit 1;;
+				make -C $1
 		esac
 	else	# 无参数
 		make || exit 1