use agetline instead of agets

also use agetline where fgets with a static buffer was used previously.

Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>

fold.c

@@ -64,7 +64,7 @@ fold(FILE *fp, long width)
 	char *buf = NULL;
 	size_t size = 0;
 
-	while(afgets(&buf, &size, fp))
+	while(agetline(&buf, &size, fp) != -1)
 		foldline(buf, width);
 	free(buf);
 }