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[libc] Use a counter in strlen

--- a/libc/src/strlen.c

+++ b/libc/src/strlen.c

@@ -5,9 +5,9 @@

 size_t

 strlen(const char *s)

 {

-	const char *t;

+	size_t n = 0;

-	for (t = s; *t; ++t)

-		/* nothing */;

-	return t - s;

+	while (*s++)

+		++n;

+	return n;

 }