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man: fix compilation of journal-iterate-poll.c
Our examples should compile...
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#include <poll.h>
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#include <time.h>
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#include <systemd/sd-journal.h>
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int wait_for_changes(sd_journal *j) {
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struct pollfd pollfd;
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uint64_t t;
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int msec;
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struct pollfd pollfd;
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sd_journal_get_timeout(m, &t);
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sd_journal_get_timeout(j, &t);
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if (t == (uint64_t) -1)
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msec = -1;
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else {
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