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u8_strwidth: do not go over the string size

--- a/src/utf8.c

+++ b/src/utf8.c

@@ -75,7 +75,10 @@

 	assert(n >= 0);

 	for(i = w = 0; i < n;){

-		i += chartorune(&r, s+i);

+		if(!fullrune(s+i, n-i))

+			return -1;

+		else

+			i += chartorune(&r, s+i);

 		ssize x = sl_wcwidth(r);

 		if(x < 0)

 			return -1;