Sort out a number of mismatched integer types in order to cut down the number of compiler warnings.

llvm-svn: 184333
diff --git a/lldb/source/Commands/CommandObjectHelp.cpp b/lldb/source/Commands/CommandObjectHelp.cpp
index 7d638a4..d2c97f9 100644
--- a/lldb/source/Commands/CommandObjectHelp.cpp
+++ b/lldb/source/Commands/CommandObjectHelp.cpp
@@ -94,7 +94,7 @@
             CommandObject *sub_cmd_obj = cmd_obj;
             // Loop down through sub_command dictionaries until we find the command object that corresponds
             // to the help command entered.
-            for (int i = 1; i < argc && all_okay; ++i)
+            for (size_t i = 1; i < argc && all_okay; ++i)
             {
                 std::string sub_command = command.GetArgumentAtIndex(i);
                 matches.Clear();