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hugetop: correct select() nfds parameter

chunsheng luorequested to merge
luffyluo/procps:hugetop into master

The nfds parameter represents the number of file descriptors to examine, not a file descriptor value. Using STDOUT_FILENO was semantically incorrect despite working coincidentally. Since we examine STDIN_FILENO only, nfds should be 1.

Signed-off-by: Chunsheng Luo luffyluo@tencent.com

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