compose.js: Refactor validate_stream_message_address_info().
compose.js: Refactor validate_stream_message_address_info().

In this commit we just refactor validate_stream_message_address_info
function to early return in case of stream_data.is_subscribed()
returns true.

hackerkid/zulip,eeshangarg/zulip,andersk/zulip,vaidap/zulip,mahim97/zulip,amanharitsh123/zulip,jrowan/zulip,mahim97/zulip,punchagan/zulip,jackrzhang/zulip,brockwhittaker/zulip,dhcrzf/zulip,kou/zulip,jrowan/zulip,zulip/zulip,brainwane/zulip,punchagan/zulip,rht/zulip,synicalsyntax/zulip,vabs22/zulip,rishig/zulip,punchagan/zulip,dhcrzf/zulip,andersk/zulip,timabbott/zulip,rishig/zulip,verma-varsha/zulip,vabs22/zulip,showell/zulip,mahim97/zulip,rishig/zulip,rht/zulip,jackrzhang/zulip,hackerkid/zulip,brainwane/zulip,Galexrt/zulip,timabbott/zulip,synicalsyntax/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,vabs22/zulip,tommyip/zulip,rht/zulip,showell/zulip,vabs22/zulip,punchagan/zulip,hackerkid/zulip,dhcrzf/zulip,showell/zulip,tommyip/zulip,zulip/zulip,rishig/zulip,kou/zulip,synicalsyntax/zulip,verma-varsha/zulip,hackerkid/zulip,rht/zulip,brockwhittaker/zulip,punchagan/zulip,synicalsyntax/zulip,andersk/zulip,eeshangarg/zulip,amanharitsh123/zulip,tommyip/zulip,synicalsyntax/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,brainwane/zulip,synicalsyntax/zulip,brainwane/zulip,jrowan/zulip,andersk/zulip,brockwhittaker/zulip,vaidap/zulip,zulip/zulip,shubhamdhama/zulip,jrowan/zulip,andersk/zulip,rishig/zulip,rht/zulip,andersk/zulip,kou/zulip,amanharitsh123/zulip,hackerkid/zulip,eeshangarg/zulip,showell/zulip,eeshangarg/zulip,dhcrzf/zulip,Galexrt/zulip,jackrzhang/zulip,verma-varsha/zulip,mahim97/zulip,dhcrzf/zulip,jackrzhang/zulip,amanharitsh123/zulip,verma-varsha/zulip,amanharitsh123/zulip,kou/zulip,timabbott/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,showell/zulip,kou/zulip,brockwhittaker/zulip,tommyip/zulip,vaidap/zulip,shubhamdhama/zulip,andersk/zulip,rht/zulip,jackrzhang/zulip,synicalsyntax/zulip,vaidap/zulip,brockwhittaker/zulip,timabbott/zulip,timabbott/zulip,shubhamdhama/zulip,amanharitsh123/zulip,showell/zulip,vabs22/zulip,rishig/zulip,kou/zulip,shubhamdhama/zulip,Galexrt/zulip,rht/zulip,jrowan/zulip,brockwhittaker/zulip,dhcrzf/zulip,Galexrt/zulip,Galexrt/zulip,vaidap/zulip,tommyip/zulip,tommyip/zulip,jackrzhang/zulip,brainwane/zulip,rishig/zulip,jrowan/zulip,timabbott/zulip,verma-varsha/zulip,showell/zulip,vaidap/zulip,zulip/zulip,zulip/zulip,vabs22/zulip,Galexrt/zulip,dhcrzf/zulip,shubhamdhama/zulip,mahim97/zulip,shubhamdhama/zulip,jackrzhang/zulip,hackerkid/zulip,Galexrt/zulip,eeshangarg/zulip,shubhamdhama/zulip,timabbott/zulip,brainwane/zulip,mahim97/zulip,verma-varsha/zulip,eeshangarg/zulip