[lldb] vFile:open unsupported error fix

This patch makes gdb-server sends EUNKNOWN error when server obtains usupported by
gdb remote protocol error code during vFile:open handling.

Author: dlav-sc

lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp

@@ -496,6 +496,17 @@ GDBRemoteCommunicationServerCommon::Handle_qSpeedTest(
   return SendErrorResponse(7);
 }
 
+static GDBErrno system_errno_to_gdb(int err) {
+switch (err) {
+#define HANDLE_ERRNO(name, value)                                              \
+case name:                                                                   \
+  return GDB_##name;
+#include "Plugins/Process/gdb-remote/GDBRemoteErrno.def"
+default:
+  return GDB_EUNKNOWN;
+}
+}
+
 GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerCommon::Handle_vFile_Open(
     StringExtractorGDBRemote &packet) {
@@ -522,9 +533,7 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_Open(
         } else {
           response.PutCString("-1");
           std::error_code code = errorToErrorCode(file.takeError());
-          if (code.category() == std::system_category()) {
-            response.Printf(",%x", code.value());
-          }
+          response.Printf(",%x", system_errno_to_gdb(code.value()));
         }
 
         return SendPacketNoLock(response.GetString());
@@ -534,17 +543,6 @@ GDBRemoteCommunicationServerCommon::Handle_vFile_Open(
   return SendErrorResponse(18);
 }
 
-static GDBErrno system_errno_to_gdb(int err) {
-  switch (err) {
-#define HANDLE_ERRNO(name, value)                                              \
-  case name:                                                                   \
-    return GDB_##name;
-#include "Plugins/Process/gdb-remote/GDBRemoteErrno.def"
-  default:
-    return GDB_EUNKNOWN;
-  }
-}
-
 GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerCommon::Handle_vFile_Close(
     StringExtractorGDBRemote &packet) {