Chef crashes when building .zap file without -r

[rwells1703]

Problem

Using chef tool on linux (commit 126f6b2) crashes when building an .zap file generated from zap tool. This only occurs when the Pigweed RPC (-r) flag is not specified in the chef.py command line options.

This is due to the options.do_rpc value being None by default. During building, this value is converted to an integer, which crashes due to int() not being able to take input as NoneType.

$ ./chef.py -zb -d my-device -t linux

Proposed Solution

Converting to an integer is unnecessary, as we are embedding the options.do_rpc value in a Python fstring. Removing this function call fixes the functionality of the -r flag to enable/disable RPC.

Although removing the int() call fixes the issue on its own, this means that the value of CONFIG_ENABLE_PW_RPC is either "1" or "None" which is a little inconsistent. To correct this, set the value to "1" if options.do_rpc is enabled, else set the value to "0" if not, ie. when options.do_rpc == None:

Result

$ ./chef.py -zb -d my-device -t linux

$ ./chef.py -zbr -d my-device -t linux