Use String8/16 c_str

Bug: 295394788
Test: make checkbuild
Change-Id: I538720d4de2dcc038b417048209782ff605b7e30
diff --git a/tools/obbtool/Main.cpp b/tools/obbtool/Main.cpp
index 64808c0..7014068 100644
--- a/tools/obbtool/Main.cpp
+++ b/tools/obbtool/Main.cpp
@@ -135,7 +135,7 @@
     }
 
     printf("OBB info for '%s':\n", filename);
-    printf("Package name: %s\n", obb->getPackageName().string());
+    printf("Package name: %s\n", obb->getPackageName().c_str());
     printf("     Version: %d\n", obb->getVersion());
     printf("       Flags: 0x%08x\n", obb->getFlags());
     printf("     Overlay: %s\n", obb->isOverlay() ? "true" : "false");