Fix for converting "OK" into "Internal error"

Whose bright idea was it to use 0 for both? Fixes problem reported
  http://www.riscosopen.org/forum/forums/4/topics/2122

Version 2.42. Tagged as 'LanManFS-2_42'

VersionNum

-/* (2.41)
+/* (2.42)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        2.41
+#define Module_MajorVersion_CMHG        2.42
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                03 Oct 2013
+#define Module_Date_CMHG                04 Oct 2013
 
-#define Module_MajorVersion             "2.41"
-#define Module_Version                  241
+#define Module_MajorVersion             "2.42"
+#define Module_Version                  242
 #define Module_MinorVersion             ""
-#define Module_Date                     "03 Oct 2013"
+#define Module_Date                     "04 Oct 2013"
 
-#define Module_ApplicationDate          "03-Oct-13"
+#define Module_ApplicationDate          "04-Oct-13"
 
 #define Module_ComponentName            "LanManFS"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Networking/Omni/Protocols/LanManFS"
 
-#define Module_FullVersion              "2.41"
-#define Module_HelpVersion              "2.41 (03 Oct 2013)"
-#define Module_LibraryVersionInfo       "2:41"
+#define Module_FullVersion              "2.42"
+#define Module_HelpVersion              "2.42 (04 Oct 2013)"
+#define Module_LibraryVersionInfo       "2:42"

c/LanMan

@@ -143,11 +143,13 @@ _kernel_oserror *MsgError(int which)
   char token[12];
   _kernel_oserror *e;
 
+  if (which == OK) return NULL; /* No error */
+
   if (which == EUSELASTSETOSERR)
   {
     /* An OS error outside this module */
     if (msg_oserr != NULL) return msg_oserr;
-    which = 0; /* Internal error! */
+    which = EHOWDTHATHAPPEN;
   }
 
   sprintf(token, "@@@@E%02u", which);

h/stdtypes

@@ -43,6 +43,7 @@ typedef int                     err_t;
 
 /* Return error codes */
 #define  OK               0
+#define  EHOWDTHATHAPPEN  0
 #define  EBADPARAM        1
 #define  ENOCONN          2
 #define  EOUTOFMEM        3