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libc: fix runestrecpy() return value (thanks spew)

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

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

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

 	while(*s1++ = *s2++){

 		if(s1 == es1){

-			*--s1 = '\0';

+			s1[-1] = '\0';

 			break;

 		}

 	}

-	return s1;

+	return s1-1;

 }