Add room for '\0' in textblock calculations.

In evas_object_textblock, the length forgot the '\0', this create a
buffer overrun.

Author: Cedric BAIL


SVN revision: 33747

legacy/evas/src/lib/canvas/evas_object_textblock.c

@@ -259,7 +259,7 @@ _strbuf_append(char *s, const char *s2, int *len, int *alloc)
 	return strdup("");
      }
    l2 = strlen(s2);
-   tlen = *len + l2;
+   tlen = *len + l2 + 1;
    if (tlen > *alloc)
      {
 	char *ts;