queue_processors: Avoid unchecked casts.
queue_processors: Avoid unchecked casts.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

kou/zulip,hackerkid/zulip,kou/zulip,brainwane/zulip,rht/zulip,zulip/zulip,showell/zulip,punchagan/zulip,andersk/zulip,kou/zulip,punchagan/zulip,timabbott/zulip,synicalsyntax/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,showell/zulip,timabbott/zulip,punchagan/zulip,brainwane/zulip,andersk/zulip,zulip/zulip,brainwane/zulip,punchagan/zulip,zulip/zulip,rht/zulip,timabbott/zulip,eeshangarg/zulip,andersk/zulip,brainwane/zulip,punchagan/zulip,zulip/zulip,zulip/zulip,timabbott/zulip,eeshangarg/zulip,timabbott/zulip,synicalsyntax/zulip,eeshangarg/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,rht/zulip,brainwane/zulip,hackerkid/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip,synicalsyntax/zulip,hackerkid/zulip,timabbott/zulip,rht/zulip,brainwane/zulip,rht/zulip,synicalsyntax/zulip,punchagan/zulip,showell/zulip,kou/zulip,showell/zulip,eeshangarg/zulip,kou/zulip,punchagan/zulip,synicalsyntax/zulip,andersk/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip