fix some null pointer accesses with empty strings

libretro-common/encodings/encoding_utf.c

@@ -154,6 +154,9 @@ size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars)
    const uint8_t *sb     = (const uint8_t*)s;
    const uint8_t *sb_org = sb;
 
+   if (!s)
+      return 0;
+
    while (*sb && chars-- > 0)
    {
       sb++;
@@ -189,6 +192,10 @@ const char *utf8skip(const char *str, size_t chars)
 size_t utf8len(const char *string)
 {
    size_t ret = 0;
+
+   if (!string)
+      return 0;
+
    while (*string)
    {
       if ((*string & 0xC0) != 0x80)

menu/drivers/xmb.c

@@ -2392,7 +2392,8 @@ static int xmb_draw_item(
          ticker_limit = 70;
    }
 
-   ticker_str      = menu_entry_get_rich_label(entry);
+   if (!string_is_empty(entry->path))
+      ticker_str      = menu_entry_get_rich_label(entry);
 
    ticker.s        = tmp;
    ticker.len      = ticker_limit;
@@ -2400,7 +2401,8 @@ static int xmb_draw_item(
    ticker.str      = ticker_str;
    ticker.selected = (i == current);
 
-   menu_animation_ticker(&ticker);
+   if (ticker.str)
+      menu_animation_ticker(&ticker);
 
    label_offset = xmb->margins_label_top;
    if (i == current && width > 320 && height > 240

menu/widgets/menu_entry.c

@@ -123,7 +123,9 @@ char *menu_entry_get_rich_label(menu_entry_t *entry)
       return NULL;
    if (!string_is_empty(entry->rich_label))
       return strdup(entry->rich_label);
-   return strdup(entry->path);
+   if (!string_is_empty(entry->path))
+      return strdup(entry->path);
+   return NULL;
 }
 
 char *menu_entry_get_sublabel(menu_entry_t *entry)