Replace hardwired error handlers in tui_initialize_io

tui_initialize_io contains a pair of hardwired fprintf/exit error
handlers.  I was unable to find any documentation as to why they're
hardwired (the code appeared in a monolithic block back in 2001:
https://sourceware.org/ml/gdb-patches/2001-07/msg00490.html) and I
was also unable to come up with a situation where error would not
be suitable, so I have replaced both handlers with calls to error.

gdb/ChangeLog:

	* tui/tui-io.c (tui_initialize_io): Replace two fprintf/exit
	pairs with calls to error.  Wrap the message with _().

1 files changed, 4 insertions, 8 deletions

diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index a890678..601d278 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -616,16 +616,12 @@ tui_initialize_io (void)
      readline output in a pipe, read that pipe and output the content
      in the curses command window.  */
   if (gdb_pipe_cloexec (tui_readline_pipe) != 0)
-    {
-      fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
-      exit (1);
-    }
+    error (_("Cannot create pipe for readline"));
+
   tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
   if (tui_rl_outstream == 0)
-    {
-      fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
-      exit (1);
-    }
+    error (_("Cannot redirect readline output"));
+
   setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
 
 #ifdef O_NONBLOCK