Fix function call to fix build

../tools/clang/lib/Driver/ToolChains/Cuda.cpp:80:18: error: reference to non-static member function must be called; did you mean to call it with no arguments?
    if (Distro(D.getVFS).IsDebian())
               ~~^~~~~~
                       ()



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@319322 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/ToolChains/Cuda.cpp

@@ -77,7 +77,7 @@ CudaInstallationDetector::CudaInstallationDetector(
     for (const char *Ver : Versions)
       CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda-" + Ver);
 
-    if (Distro(D.getVFS).IsDebian())
+    if (Distro(D.getVFS()).IsDebian())
       // Special case for Debian to have nvidia-cuda-toolkit work
       // out of the box. More info on http://bugs.debian.org/882505
       CudaPathCandidates.push_back(D.SysRoot + "/usr/lib/cuda");