Fix abort when exporting JPEGs from save menu

Pesky C letting me cast a pointer as a pointer to a pointer. Extra indirection added.
Reported by Christopher Dewhurst.

Version 1.21. Tagged as 'Draw-1_21'

!Dir,feb

-| Copyright 1996 Acorn Computers Ltd
-|
-| Licensed under the Apache License, Version 2.0 (the "License");
-| you may not use this file except in compliance with the License.
-| You may obtain a copy of the License at
-|
-|     http://www.apache.org/licenses/LICENSE-2.0
-|
-| Unless required by applicable law or agreed to in writing, software
-| distributed under the License is distributed on an "AS IS" BASIS,
-| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-| See the License for the specific language governing permissions and
-| limitations under the License.
-|
-Dir <Obey$Dir>

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "1.20"
-Module_Version          SETA    120
+Module_MajorVersion     SETS    "1.21"
+Module_Version          SETA    121
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "14 Jan 2012"
-Module_ApplicationDate  SETS    "14-Jan-12"
+Module_Date             SETS    "11 Aug 2012"
+Module_ApplicationDate  SETS    "11-Aug-12"
 Module_ComponentName    SETS    "Draw"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Apps/Draw"
-Module_FullVersion      SETS    "1.20"
-Module_HelpVersion      SETS    "1.20 (14 Jan 2012)"
+Module_FullVersion      SETS    "1.21"
+Module_HelpVersion      SETS    "1.21 (11 Aug 2012)"
                         END

VersionNum

-/* (1.20)
+/* (1.21)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        1.20
+#define Module_MajorVersion_CMHG        1.21
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                14 Jan 2012
+#define Module_Date_CMHG                11 Aug 2012
 
-#define Module_MajorVersion             "1.20"
-#define Module_Version                  120
+#define Module_MajorVersion             "1.21"
+#define Module_Version                  121
 #define Module_MinorVersion             ""
-#define Module_Date                     "14 Jan 2012"
+#define Module_Date                     "11 Aug 2012"
 
-#define Module_ApplicationDate          "14-Jan-12"
+#define Module_ApplicationDate          "11-Aug-12"
 
 #define Module_ComponentName            "Draw"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Apps/Draw"
 
-#define Module_FullVersion              "1.20"
-#define Module_HelpVersion              "1.20 (14 Jan 2012)"
-#define Module_LibraryVersionInfo       "1:20"
+#define Module_FullVersion              "1.21"
+#define Module_HelpVersion              "1.21 (11 Aug 2012)"
+#define Module_LibraryVersionInfo       "1:21"

c/DrawFileIO

@@ -1917,19 +1917,21 @@ static BOOL exportJPEG (diagrec *diag, char *filename, fileIO_method method,
 
 { int ok = TRUE, f;
   draw_objptr hdrptr;
+  void       *jpegptr;
 
   ftracef0 ("draw_file: exportJPEG\n");
 
   claim_xfersend (diag, method, maxbuf);
 
   hdrptr.bytep = diag->paper + draw_selection->array [0];
+  jpegptr = &hdrptr.jpegp->image;
 
   /*Create and open the file*/
   if ((ok = open_save (filename, FileType_JPEG, 0, &f)) == FALSE)
     goto finish;
 
   /* Save the data. */
-  if ((ok = draw_file_write_bytes (f, (char **)&hdrptr.jpegp->image, 0, hdrptr.jpegp->len)) == FALSE)
+  if ((ok = draw_file_write_bytes (f, (char **)&jpegptr, 0, hdrptr.jpegp->len)) == FALSE)
     goto finish;
 
 finish: