* Add has_debugger_command() so whether or not a debugger command is available

can be checked.
* Make the usb_keyboard module check the presence of the needed debugger
  commands to avoid the error messages in case of them being unavailable.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29472 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/debug_commands.cpp

@@ -496,6 +496,14 @@ print_debugger_command_usage(const char* commandName)
 }
 
 
+bool
+has_debugger_command(const char* commandName)
+{
+	bool ambiguous;
+	return find_debugger_command(commandName, false, ambiguous) != NULL;
+}
+
+
 //	#pragma mark - public API
 
 int