Minor ipc_message_util cleanup.

tools/ipc_fuzzer/mutate/message_util.cc

Index: tools/ipc_fuzzer/mutate/message_util.cc
diff --git a/tools/ipc_fuzzer/mutate/message_util.cc b/tools/ipc_fuzzer/mutate/message_util.cc
index 85ce14b7492c7da31c45d33f3b42f9197bb3aeb7..deeb2d016f462ad5c3ea20677961098ef526247f 100644
--- a/tools/ipc_fuzzer/mutate/message_util.cc
+++ b/tools/ipc_fuzzer/mutate/message_util.cc
@@ -30,7 +30,7 @@ const char kHelpSwitchHelp[] =
 
 const char kInSwitch[] = "in";
 const char kInSwitchHelp[] =
-    "output only the messages in the specified list.";
+    "output only the messages at the specified positions in the file.";
 
 const char kInvertSwitch[] = "invert";
 const char kInvertSwitchHelp[] =
@@ -102,9 +102,6 @@ int main(int argc, char** argv) {
       end_index = static_cast<size_t>(temp);
   }
 
-  bool has_indices = cmd->HasSwitch(kInSwitch);
-  std::vector<bool> indices;
-
   bool has_regexp = cmd->HasSwitch(kRegexpSwitch);
   RE2 filter_pattern(cmd->GetSwitchValueASCII(kRegexpSwitch));
 
@@ -134,6 +131,9 @@ int main(int argc, char** argv) {
     message_vector.weak_clear();
   }
 
+  bool has_indices = cmd->HasSwitch(kInSwitch);
+  std::vector<bool> indices;
+
   if (has_indices) {
     indices.resize(input_message_vector.size(), false);
     std::vector<std::string> index_strings;