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[libc] Make strrchr style consistent with the rest

--- a/libc/src/strrchr.c

+++ b/libc/src/strrchr.c

@@ -5,11 +5,11 @@

 char *

 strrchr(const char *s, int c)

 {

-	char *t;

+	const char *t = s;

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

-		/* nothing */;

+	while (*t)

+		++t;

 	while (t > s && *t != c)

 		--t;

-	return (*t == c) ? t : NULL;

+	return (*t == c) ? (char *)t : NULL;

 }