proc: add .gitignore for proc-subset-pid selftest

This new selftest needs an entry in the .gitignore file otherwise git
will try to track the binary.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 268af17ada5855 ("selftests: proc: test subset=pid")
Signed-off-by: David Matlack <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Alexey Gladkov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions