more -Wall warning fixes from Cristian Ionescu-Idbohrn.
This time it resulted in small code changes: function old new delta nexpr 820 828 +8 tail_main 1200 1202 +2 wrapf 166 167 +1 parse_mount_options 227 209 -18 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18) Total: -7 bytes
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		@@ -126,7 +126,7 @@ static int pid_is_user(int pid)
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	sprintf(buf, "/proc/%u", pid);
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	if (stat(buf, &sb) != 0)
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		return 0;
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	return (sb.st_uid == user_id);
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	return (sb.st_uid == (uid_t)user_id);
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}
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static int pid_is_cmd(pid_t pid)
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