Minor cosmetic fix in the credit scroller

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4053 a1c6a512-1295-4272-9138-f99709370657

apps/credits.c

@@ -83,6 +83,7 @@ void roll_credits(void)
             lcd_putsxy(0, i*height+y, line+i<numnames?credits[line+i]:"");
         snprintf(buffer, sizeof(buffer), " [Credits] %2d/%2d  ",
                  line+1, numnames);
+        lcd_clearrect(0, 0, LCD_WIDTH, height);
         lcd_putsxy(0, 0, buffer);
         lcd_update();