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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		@@ -710,7 +710,7 @@ static void wrapf(const char *message, ...)
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{
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	char buf[128];
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	va_list args;
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	int buflen;
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	unsigned buflen;
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	va_start(args, message);
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	buflen = vsnprintf(buf, sizeof(buf), message, args);
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