repo-add: fix exit on mktemp failure
Before this change, exit 1 applied to the subshell between ( ) and did no exit the main shell on mktemp failure. This converts the subshell to a group of commands in the main shell with { }.
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Before this change, exit 1 applied to the subshell between ( ) and did no exit the main shell on mktemp failure. This converts the subshell to a group of commands in the main shell with { }.