devtool: minor fix for error message

There is no -N/--name option for devtool, that's a recipetool option -
with devtool you just specify the name as a positional argument.

(From OE-Core rev: d2bc0cba5ca8a7220ffe1ef96acf856fe972ce7c)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/standard.py

@@ -150,7 +150,7 @@ def add(args, config, basepath, workspace):
             stdout, _ = exec_build_env_command(config.init_path, basepath, 'recipetool --color=%s create -o %s "%s" %s' % (color, tempdir, source, extracmdopts))
         except bb.process.ExecutionError as e:
             if e.exitcode == 15:
-                raise DevtoolError('Unable to auto-determine name from source tree, please specify it with -N/--name')
+                raise DevtoolError('Unable to auto-determine recipe name from source tree, please specify it on the command line')
             else:
                 raise DevtoolError('Command \'%s\' failed:\n%s' % (e.command, e.stdout))