Fix a stack-smasher in PlatformMacOSX::GetSDKDirectory()

GetSDKVersion expects the number of version fields not their byte size
and will happily overwrite later contents of the stack.

Differential Revision: https://reviews.llvm.org/D61218

llvm-svn: 359471

lldb/source/Plugins/Platform/MacOSX/PlatformMacOSX.cpp

@@ -164,7 +164,7 @@ ConstString PlatformMacOSX::GetSDKDirectory(lldb_private::Target &target) {
       std::string default_xcode_sdk;
       FileSpec fspec;
       uint32_t versions[2];
-      if (objfile->GetSDKVersion(versions, sizeof(versions))) {
+      if (objfile->GetSDKVersion(versions, 2)) {
         fspec = HostInfo::GetShlibDir();
         if (fspec) {
           std::string path;