Fix corrupt R0 during JPEG plot

The JPEG_PlotScaled SWI (and friends) was pulling R0 at the wrong moment, so corrupting it. This manifested as "Incomplete or corrupt JPEG" when trying to plot a JPEG via the PostScript driver for example (which expects R0 preserved for no error).
Looks like ~5 year old bug, presumably not many people printing JPEGs to PostScript, or all suffering in silence.
Tested on a Risc PC - printed a picture from !Draw to postscript, then PDF'd it.

Version 1.69. Tagged as 'SprExtend-1_69'

Sources/SWIs

@@ -448,8 +448,8 @@ jpegscaled_exit
         MOV     r1, sp
         Debug   gs,"ok1. sp = ",r1
       ]
+        Pull    "R0"                              ; original R0 (pjs_r0save)
         ADD     sp,sp,#pjs_end-pjs_table          ; junk the fake sprite and colourtrans table
-        Pull    "R0"                              ; original R0 (pjs_jpegdata)
         Debug   gs,"r0 when loaded =",R0
       [ debuggs
         MOV     r1, sp
@@ -461,7 +461,7 @@ jpegscaled_exit
         Debug   gs,"X R8-9",R8,R9
         MOV     pc, lr
 20
-        ADD     sp,sp,#4                          ; junk pjs_jpegdata
+        ADD     sp,sp,#4                          ; junk pjs_r0save
         SUB     sp,sp,#pjs_table-pjs_start        ; correct for the ADD in 'jpegscaled_errorexit' moving stack too far.
         TST     r0, #ERROR_BAD_JPEG               ; C code returned bad jpeg error
         BNE     jpegscaled_errorexit1

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "1.68"
-Module_Version          SETA    168
+Module_MajorVersion     SETS    "1.69"
+Module_Version          SETA    169
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "26 Sep 2015"
-Module_ApplicationDate  SETS    "26-Sep-15"
+Module_Date             SETS    "11 Jan 2016"
+Module_ApplicationDate  SETS    "11-Jan-16"
 Module_ComponentName    SETS    "SprExtend"
 Module_ComponentPath    SETS    "mixed/RiscOS/Sources/Video/Render/SprExtend"
-Module_FullVersion      SETS    "1.68"
-Module_HelpVersion      SETS    "1.68 (26 Sep 2015)"
+Module_FullVersion      SETS    "1.69"
+Module_HelpVersion      SETS    "1.69 (11 Jan 2016)"
                         END

VersionNum

-/* (1.68)
+/* (1.69)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        1.68
+#define Module_MajorVersion_CMHG        1.69
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                26 Sep 2015
+#define Module_Date_CMHG                11 Jan 2016
 
-#define Module_MajorVersion             "1.68"
-#define Module_Version                  168
+#define Module_MajorVersion             "1.69"
+#define Module_Version                  169
 #define Module_MinorVersion             ""
-#define Module_Date                     "26 Sep 2015"
+#define Module_Date                     "11 Jan 2016"
 
-#define Module_ApplicationDate          "26-Sep-15"
+#define Module_ApplicationDate          "11-Jan-16"
 
 #define Module_ComponentName            "SprExtend"
 #define Module_ComponentPath            "mixed/RiscOS/Sources/Video/Render/SprExtend"
 
-#define Module_FullVersion              "1.68"
-#define Module_HelpVersion              "1.68 (26 Sep 2015)"
-#define Module_LibraryVersionInfo       "1:68"
+#define Module_FullVersion              "1.69"
+#define Module_HelpVersion              "1.69 (11 Jan 2016)"
+#define Module_LibraryVersionInfo       "1:69"