COMP: Typo in "const_cast".

Author: dgobbi

Graphics/vtkRInterface.cxx

@@ -78,7 +78,7 @@ class vtkImplementationRSingleton
     const char* path2 = vtksys::SystemTools::GetEnv("R_HOME");
     const char *R_argv[]= {"vtkRInterface", "--gui=none", "--no-save", "--no-readline", "--silent"};
 
-    Rf_initialize_R(sizeof(R_argv)/sizeof(R_argv[0]), const_cast<char *>(R_argv));
+    Rf_initialize_R(sizeof(R_argv)/sizeof(R_argv[0]), const_cast<char **>(R_argv));
 
 #ifdef CSTACK_DEFNS
     R_CStackLimit = (uintptr_t)-1;