Try cleaning the edges of the flap and the ice chute as well. Once you've done that, check to see if the pivot rod is fully engaged at end side, as having it out of position could be causing it to "hang up" and not fully close.
If the rod has been knocked out of position, reposition it with your hands then you can lightly lube each end at the pivot points, with a food grade silicon lubricating spray. Use ONLY a food grade lubricant so you don't end up getting nasty tasting ice cubes or contaminating the cubes as they pass thru the chute and flap.
If that doesn't resolve the problem, you'll need to remove the chute & flap assembly from the dispenser section of the door and check for the return spring engagement, as it may have become disconnected and as a result, isn't closing the flap fully, as it should.
To do this, you'll need to remove the trim bezel around the dispenser section with a plastic putty knive (to avoid scratching the trim). be very careful when prying the bezel, do it VERY carefully so as not to snap/break the trim piece. Once you have that removed, you can see and get at the retaining screw(s) that hold the chute & flap assembly on the door panel.
Check the line drawing attached for proper part placement of the spring (part #63) and for seeing how your particular dispenser is attached to the freezer door.
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=GSH22KGMBWW&productCategoryId=0165000&brandId=0432&modelName=REFRIGERATOR-M-SERIES&diagramPageId=00004&componentDescription=FREEZER%20DOOR&documentId=G0311032&backToLink=Return%20to%20Sub%20Components%20list#partLst
Hope you find this Very Helpful and best regards!
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