record-btrace: fix insn range in function call history

With the "/i" modifier, we print the instruction number range in the
"record function-call-history" command as [begin, end).

It would be more intuitive if we printed the range as [begin, end].

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* record-btrace.c (btrace_call_history_insn_range): Print
	insn range as [begin, end].

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
+
+	* record-btrace.c (btrace_call_history_insn_range): Print
+	insn range as [begin, end].
+
 2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
 
 	* btrace.h (struct btrace_func_link): New.

gdb/record-btrace.c

@@ -424,10 +424,13 @@ static void
 btrace_call_history_insn_range (struct ui_out *uiout,
 				const struct btrace_function *bfun)
 {
-  unsigned int begin, end;
+  unsigned int begin, end, size;
+
+  size = VEC_length (btrace_insn_s, bfun->insn);
+  gdb_assert (size > 0);
 
   begin = bfun->insn_offset;
-  end = begin + VEC_length (btrace_insn_s, bfun->insn);
+  end = begin + size - 1;
 
   ui_out_field_uint (uiout, "insn begin", begin);
   ui_out_text (uiout, "-");