tee: fix -p behavior upon broken pipe stdout #6218

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	16s
Style/spelling (ubuntu-latest, feat_os_unix)	1m 21s
Style/lint (ubuntu-latest, feat_os_unix)	1m 44s
Style/lint (macos-latest, feat_os_macos)	1m 22s
Style/toml	10s
Style/lint (windows-latest, feat_os_windows)	7m 58s
	12m 51s

Provide feedback