Get State of Debug Watchpoint

Returns the state of a debug watchpoint that was previously
set using the Set Debug Watchpoint function (Int 31H
Function 0B00H).

Call With:

   AX     = 0B02H
   BX     = watchpoint handle

Returns:

   if function successful
   Carry flag= clear
   AX     = watchpoint status
           Bit    Significance
           0      0 = watchpoint has not been encountered
                  1 = watchpoint has been encountered
           1-15   reserved

   if function unsuccessful
   Carry flag= set
   AX     = error code
           8023H   invalid handle

Notes:

o  The client can use Int 31H Fn 0B03H to clear the
   watchpoint state without releasing the watchpoint handle.