INT 2F - NETWORK REDIRECTOR - CLOSE REMOTE FILE

	AX = 1106h
	ES:DI -> filled-in SFT (assumed to point at SDA's current SFT field)
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    SFT updated (redirector must decrement open count, which may be
		  done with INT 2F/AX=1208h)
	ES:DI must be preserved
Note:	this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1116h,AX=1201h,AX=1208h,AX=1227h,INT 21/AH=3Eh