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Revert "[libc] Use a counter in strlen"

This reverts commit 154b5717a3ebfb71ccb7fa130a64cf90eae0bf5b.

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

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

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

 size_t

 strlen(const char *s)

 {

-	size_t n = 0;

+	const char *t;

-	while (*s++)

-		++n;

-	return n;

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

+		/* nothing */;

+	return t - s;

 }