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[libc] Make strcat style consistent with the rest

--- a/libc/src/strcat.c

+++ b/libc/src/strcat.c

@@ -5,10 +5,10 @@

 char *

 strcat(char *dst, const char *src)

 {

-	char *ret;

+	char *ret = dst;

-	for (ret = dst; *dst; ++dst)

-		/* nothing */;

+	while (*dst)

+		++dst;

 	while (*dst++ = *src++)

 		/* nothing */;

 	return ret;