Fix for stack imbalance

In revision 4.17 the extra argument in R5 changed the stack frame, but the 'file not found' error exit was missed.
Submission from Rick Murray. Fixes ticket #398.

Version 1.64. Tagged as 'SprExtend-1_64'

Sources/SWIs

@@ -590,7 +590,7 @@ jpegplotfilescaled_exit1
 
 jpegplotfilescaled_nofile
         ADRL    R0,ErrorBlock_NoFile
-        Pull    "R1-R4"
+        Pull    "R1-R5"
         MOV     r4, r1
         Pull    "R1"                     ;should be r0 saved at start...
         BL      copy_error_one

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "1.63"
-Module_Version          SETA    163
+Module_MajorVersion     SETS    "1.64"
+Module_Version          SETA    164
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "27 Mar 2014"
-Module_ApplicationDate  SETS    "27-Mar-14"
+Module_Date             SETS    "06 Dec 2014"
+Module_ApplicationDate  SETS    "06-Dec-14"
 Module_ComponentName    SETS    "SprExtend"
 Module_ComponentPath    SETS    "mixed/RiscOS/Sources/Video/Render/SprExtend"
-Module_FullVersion      SETS    "1.63"
-Module_HelpVersion      SETS    "1.63 (27 Mar 2014)"
+Module_FullVersion      SETS    "1.64"
+Module_HelpVersion      SETS    "1.64 (06 Dec 2014)"
                         END

VersionNum

-/* (1.63)
+/* (1.64)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        1.63
+#define Module_MajorVersion_CMHG        1.64
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                27 Mar 2014
+#define Module_Date_CMHG                06 Dec 2014
 
-#define Module_MajorVersion             "1.63"
-#define Module_Version                  163
+#define Module_MajorVersion             "1.64"
+#define Module_Version                  164
 #define Module_MinorVersion             ""
-#define Module_Date                     "27 Mar 2014"
+#define Module_Date                     "06 Dec 2014"
 
-#define Module_ApplicationDate          "27-Mar-14"
+#define Module_ApplicationDate          "06-Dec-14"
 
 #define Module_ComponentName            "SprExtend"
 #define Module_ComponentPath            "mixed/RiscOS/Sources/Video/Render/SprExtend"
 
-#define Module_FullVersion              "1.63"
-#define Module_HelpVersion              "1.63 (27 Mar 2014)"
-#define Module_LibraryVersionInfo       "1:63"
+#define Module_FullVersion              "1.64"
+#define Module_HelpVersion              "1.64 (06 Dec 2014)"
+#define Module_LibraryVersionInfo       "1:64"