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strtoull: fix return value on overflow

--- a/sys/src/libc/port/strtoull.c

+++ b/sys/src/libc/port/strtoull.c

@@ -1,7 +1,7 @@

 #include <u.h>

 #include <libc.h>

-#define UVLONG_MAX	(1LL<<63)

+#define UVLONG_MAX	(~0ULL)

 uvlong

 strtoull(char *nptr, char **endptr, int base)