bug#23374: auth-source-macos-keychain-search pass in port only if it's provided

[Jun Hao]

Hi,

When calling auth-source-search without port on OSX, current code will
bind port to "nil" and generate wrong command. E.g:

(auth-source-search :user "test") will yield command:

/usr/bin/security find-generic-password -g -a "test" -s "nil"

The correct one should be:

/usr/bin/security find-generic-password -g -a "test"

Please see attachment for this simple patch

Thanks - Jun

0001-Pass-in-port-only-if-provided-by-caller.patch
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