libdthelp: Resolve 65 -Wunused-variable warnings

cde/lib/DtHelp/il/ildecompjpeg.c

@@ -154,7 +154,6 @@ static ilError ilDecompJIFExecute (
     register ilJPEGPrivPtr pPriv;
     ilError             error;
     int                 i;
-    iljpgPtr            pJPEGPriv;
     iljpgPtr            pPixels[ILJPG_MAX_COMPS];
     long                nBytesPerRow[ILJPG_MAX_COMPS];
     ilImagePlaneInfo   *pPlane;

cde/lib/DtHelp/il/iljpgdedct.c

@@ -254,7 +254,6 @@ void _iljpgDeDCTFull (
     )
 {
   register int   i;
-  register float *oxptr;
   register int   *zptr;
   float           ox[64];
   register float in0, in1, in2, in3, in4, in5, in6, in7;
@@ -551,7 +550,7 @@ void _iljpgDeDCT4x4 (
   register int   i;
   register int   *zptr;
   float           ox[64];
-  register float in0, in2, in3, in4, in5, in6, in7;
+  register float in0, in2, in3, in4, in5, in7;
   register float tmp0, tmp1, tmp2, tmp5, tmp6, tmp7;
   register float tmp;
   register float *oxaddr;

cde/lib/DtHelp/il/iljpgdehuff.c

@@ -490,7 +490,7 @@ iljpgError _iljpgDehuffExecute (
         iljpgDehuffPtr  pHuffPriv;
         int             coeff_ct = 0;
 #define         is_dc   (!coeff_ct)     /* First coefficient is DC */
-        int             i, delta;
+        int             delta;
         int             len, zrun; 
         register BITBUF bitbuf, ch, c;
         register int    bitsleft;
@@ -556,7 +556,6 @@ iljpgError _iljpgDehuffExecute (
                 next byte (which can't be a marker or error!); set into bitbuf.
             */
         if (pHuffPriv->resetDone) {
-            int         resetSeen = FALSE;
             pHuffPriv->resetDone = 0;
             if (!ILJPG_DECODE_GET_BYTE (stream, ch, error))
                 return error;                   /* must be more bytes after restart */

cde/lib/DtHelp/il/ilmap.c

@@ -199,7 +199,6 @@ ilPipeInfo              info;
 ilImageDes              des;
 ilImageFormat           format;
 ilImageInfo            *pInfo;
-long                    width, height;
 int                     i;
 ilError               (*executeProc) ();
 

cde/lib/DtHelp/il/iltiff.c

@@ -981,7 +981,7 @@ ilError                 error;
 long                    imageSequenceNumber;
 ilByte                  fourBytes [4];
 ilFileOffset            IFDOffset;
-ilFileImagePtr          pFileImage, pFileImageHead, pPrevFileImage;
+ilFileImagePtr          pFileImage, pPrevFileImage;
 ilTIFFHeader            header;
 register ilFilePtr      pFile;
 register ilBool         bigEndian;

cde/lib/DtHelp/il/iltiffread.c

@@ -155,7 +155,6 @@ static ilError ilReadFileInit (
 register ilReadFilePrivPtr pPriv = (ilReadFilePrivPtr)pPrivate;
 ilFileImagePtr          pFileImage;
 ilError                 error;
-long                    dstRowBytes;
 register ilFileTag     *pTag;
 
     /*  Data for tags to read: "numbers" is the array of tag ids, "nTags" in length.