Silence some clang warnings

Silences -Wmissing-brace and -Wformat-pedantic warnings from clang on Linux.  NFC.

llvm-svn: 260914
diff --git a/lldb/tools/driver/Driver.cpp b/lldb/tools/driver/Driver.cpp
index 0b72e22..ffd5516 100644
--- a/lldb/tools/driver/Driver.cpp
+++ b/lldb/tools/driver/Driver.cpp
@@ -914,7 +914,8 @@
         {
             fprintf(stderr, "error: write(%i, %p, %" PRIu64 ") failed (errno = %i) "
                             "when trying to open LLDB commands pipe\n",
-                    fds[WRITE], commands_data, static_cast<uint64_t>(commands_size), errno);
+                    fds[WRITE], static_cast<const void *>(commands_data),
+                    static_cast<uint64_t>(commands_size), errno);
         }
         else if (static_cast<size_t>(nrwr) == commands_size)
         {