Allow adb to handle single paramter with install-multi-package flag

Bug: 130164367
Test: $adb install-multi-package dummy.apk
      It installs successfully.

Change-Id: I5775813d10b7a8d865518ce5480a401e8f41e876
diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index 728e5c1..940a416 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -1811,7 +1811,7 @@
         if (argc < 2) error_exit("install-multiple requires an argument");
         return install_multiple_app(argc, argv);
     } else if (!strcmp(argv[0], "install-multi-package")) {
-        if (argc < 3) error_exit("install-multi-package requires an argument");
+        if (argc < 2) error_exit("install-multi-package requires an argument");
         return install_multi_package(argc, argv);
     } else if (!strcmp(argv[0], "uninstall")) {
         if (argc < 2) error_exit("uninstall requires an argument");