USB EHCI QH handling patch

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++2013-09-21  Ales Nesrsta <starous@volny.cz>
++
++      * grub-core/bus/usb/ehci.c: Correceted EHCI QH handling (async./sync.)
++
  2013-09-20  Vladimir Serbinenko  <phcoder@gmail.com>
  
        * grub-core/disk/diskfilter.c: Handle non-md UUIDs.