StdLib: Correct two instances of mismatch between function declaration and definition causing GCC compile errors.

StdLib\Include\Containers\Fifo.h
  Change return type of cFIFO_Truncate to size_t.  Makes declaration match definition.
  Update comment to describe what is returned.
        
StdLib\LibC\Uefi\InteractiveIO\IIOutilities.c
  Change return type of IIO_CursorDelta to int. Makes declaration match definition.
  Change other types from INT32 to int, for consistency.
  Update comment for returned values.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by:  daryl.mcdaniel@intel.com
Reviewed-by:    erik.c.bjorge@intel.com


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14060 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/Include/Containers/Fifo.h

@@ -151,8 +151,10 @@ typedef size_t     (EFIAPI *cFIFO_Flush)   (cFIFO *Self, size_t NumToFlush);
 /** Remove the most recent element from the FIFO.
 
     @param[in]    Self              Pointer to the FIFO instance.
+
+    @return     Returns the number of elements remaining in the FIFO.
 **/
-typedef void        (EFIAPI *cFIFO_Truncate)  (cFIFO *Self);
+typedef size_t        (EFIAPI *cFIFO_Truncate)  (cFIFO *Self);
 
 /** Cleanly delete a FIFO instance.