Fix the following warnings from staticcheck linter:
```
pkg/term/term_linux_test.go:34:2: SA5001: should check returned error before deferring tty.Close() (staticcheck)
defer tty.Close()
^
pkg/term/term_linux_test.go:52:2: SA5001: should check returned error before deferring tty.Close() (staticcheck)
defer tty.Close()
^
pkg/term/term_linux_test.go:67:2: SA5001: should check returned error before deferring tty.Close() (staticcheck)
defer tty.Close()
^
....
```
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Also remove the test flag from pkg/term and jsut checkuid directly.
Fixed a problem with a pkg/term test that was leaving the terminal in a bad
state.
Signed-off-by: Daniel Nephin <dnephin@docker.com>
