Export account_output from output.c

Adjust calls to pass account variable explicitly.
Call it from lens_default as well.
diff --git a/lens_default.c b/lens_default.c
index 6e87a8e..fc8b0e4 100644
--- a/lens_default.c
+++ b/lens_default.c
@@ -107,19 +107,11 @@
 #undef HANDLE_WIDTH
 
 static int
-account(int *countp, int c)
-{
-	if (c >= 0)
-		*countp += c;
-	return c;
-}
-
-static int
 acc_fprintf(int *countp, FILE *stream, const char *format, ...)
 {
 	va_list pa;
 	va_start(pa, format);
-	int i = account(countp, vfprintf(stream, format, pa));
+	int i = account_output(countp, vfprintf(stream, format, pa));
 	va_end(pa);
 
 	return i;
@@ -181,7 +173,8 @@
 {
 	int written = 0;
 	if (acc_fprintf(&written, stream, "'") < 0
-	    || account(&written, format_char(stream, value, arguments)) < 0
+	    || account_output(&written,
+			      format_char(stream, value, arguments)) < 0
 	    || acc_fprintf(&written, stream, "'") < 0)
 		return -1;