Convert comment to C-style to prevent warning

llvm-svn: 322880

clang/tools/c-index-test/c-index-test.c

@@ -739,7 +739,7 @@ static CXString CursorToText(CXCursor Cursor) {
   }
   }
   assert(0 && "unknown display type"); /* no llvm_unreachable in C. */
-  // Set to NULL to prevent uninitialized variable warnings.
+  /* Set to NULL to prevent uninitialized variable warnings. */
   text.data = NULL;
   text.private_flags = 0;
   return text;