Fix "Task not known" error masking real error message in some situations

Detail:
  c/armsys - _desktop_report now always caches the error message in the local error block. This avoids the error potentially being overwritten with "Task not known" if TaskManager_TaskNameFromHandle fails.
Admin:
  Tested on Raspberry Pi


Version 5.72. Tagged as 'RISC_OSLib-5_72'

VersionASM

@@ -11,13 +11,13 @@
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
                         GBLS    Module_ComponentPath
-Module_MajorVersion     SETS    "5.71"
-Module_Version          SETA    571
+Module_MajorVersion     SETS    "5.72"
+Module_Version          SETA    572
 Module_MinorVersion     SETS    ""
-Module_Date             SETS    "15 Aug 2012"
-Module_ApplicationDate  SETS    "15-Aug-12"
+Module_Date             SETS    "28 Aug 2012"
+Module_ApplicationDate  SETS    "28-Aug-12"
 Module_ComponentName    SETS    "RISC_OSLib"
 Module_ComponentPath    SETS    "castle/RiscOS/Sources/Lib/RISC_OSLib"
-Module_FullVersion      SETS    "5.71"
-Module_HelpVersion      SETS    "5.71 (15 Aug 2012)"
+Module_FullVersion      SETS    "5.72"
+Module_HelpVersion      SETS    "5.72 (28 Aug 2012)"
                         END

VersionNum

-/* (5.71)
+/* (5.72)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        5.71
+#define Module_MajorVersion_CMHG        5.72
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                15 Aug 2012
+#define Module_Date_CMHG                28 Aug 2012
 
-#define Module_MajorVersion             "5.71"
-#define Module_Version                  571
+#define Module_MajorVersion             "5.72"
+#define Module_Version                  572
 #define Module_MinorVersion             ""
-#define Module_Date                     "15 Aug 2012"
+#define Module_Date                     "28 Aug 2012"
 
-#define Module_ApplicationDate          "15-Aug-12"
+#define Module_ApplicationDate          "28-Aug-12"
 
 #define Module_ComponentName            "RISC_OSLib"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Lib/RISC_OSLib"
 
-#define Module_FullVersion              "5.71"
-#define Module_HelpVersion              "5.71 (15 Aug 2012)"
-#define Module_LibraryVersionInfo       "5:71"
+#define Module_FullVersion              "5.72"
+#define Module_HelpVersion              "5.72 (28 Aug 2012)"
+#define Module_LibraryVersionInfo       "5:72"

c/armsys

@@ -176,6 +176,7 @@ static int _desktop_report(const char *s, const char *but)
     if ((e = _kernel_last_oserror()) != NULL && s == e->errmess)
     {
         flags |= 2 << 9;
+        err = *e;
     }
     else
     {
@@ -200,15 +201,13 @@ static int _desktop_report(const char *s, const char *but)
 
         *p = '\0';
         err.errmess[0] = toupper(err.errmess[0]);
-
-        e = &err;
     }
     r.r[0] = h;
     if (_kernel_swi(TaskManager_TaskNameFromHandle, &r, &r) == 0)
         r.r[2] = r.r[0];
     else
         r.r[2] = 0;
-    r.r[0] = (int) e;
+    r.r[0] = (int) &err;
     r.r[1] = flags;
     r.r[3] = 0;
     r.r[4] = 1;