[PATCH] Don't throw an error in "show mpx bound" implementation

[Patrick Palka <patrick@parcs.ath.cx>]

"show" functions should not throw an exception in part because it causes
the output of the commands "info set" and "show" to get truncated.

This fixes the following fails:

    FAIL: gdb.base/default.exp: info set
    FAIL: gdb.base/default.exp: show

gdb/ChangeLog:

	* i386-tdep.c (i386_mpx_info_bounds): Don't call error, instead
	use printf_unfiltered.
	(set_mpx_cmd): Add missing trailing space to command string
	literal.
	(_initialize_i386_tdep): Give the "mpx" prefix command its
	correct name.
---
 gdb/i386-tdep.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 85e433e..371a282 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -8775,11 +8775,17 @@ i386_mpx_info_bounds (char *args, int from_tty)
   struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
 
   if (!i386_mpx_enabled ())
-    error (_("Intel(R) Memory Protection Extensions not\
- supported on this target."));
+    {
+      printf_unfiltered (_("Intel(R) Memory Protection Extensions not "
+			   "supported on this target.\n"));
+      return;
+    }
 
   if (args == NULL)
-    error (_("Address of pointer variable expected."));
+    {
+      printf_unfiltered (_("Address of pointer variable expected.\n"));
+      return;
+    }
 
   addr = parse_and_eval_address (args);
 
@@ -8854,7 +8860,7 @@ static struct cmd_list_element *mpx_set_cmdlist, *mpx_show_cmdlist;
 static void
 set_mpx_cmd (char *args, int from_tty)
 {
-  help_list (mpx_set_cmdlist, "set mpx", all_commands, gdb_stdout);
+  help_list (mpx_set_cmdlist, "set mpx ", all_commands, gdb_stdout);
 }
 
 /* Helper function for the CLI commands.  */
@@ -8899,7 +8905,7 @@ is \"default\"."),
 
   add_prefix_cmd ("mpx", class_support, set_mpx_cmd, _("\
 Set Intel(R) Memory Protection Extensions specific variables."),
-		  &mpx_set_cmdlist, "set tdesc ",
+		  &mpx_set_cmdlist, "set mpx ",
 		  0 /* allow-unknown */, &setlist);
 
   /* Add "mpx" prefix for the show commands.  */
-- 
2.5.0.rc0.5.g91e10c5.dirty