cairodriver fix typo

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@55399 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/cairodriver/Text.c

@@ -61,7 +61,7 @@ static char *convert(const char *in)
 	unsigned char *p2 = (unsigned char *) out;
 	int i, j;
 
-	for (i = j = 0; i < len; i++) {
+	for (i = j = 0; i < ilen; i++) {
 	    int c = p1[i];
 	    if (c < 0x80)
 		p2[j++] = c;