[patch] Remove write-only local variable sw_single_step_trap_p

[Yao Qi <yao@codesourcery.com>]

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Local variable sw_single_step_trap_p is not read in
handle_inferior_event.  We can safely remove it.

It is somewhat obvious, and I'll check it in in 24 hours if no objection.

-- 
Yao (齐尧)

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2011-06-21  Yao Qi  <yao@codesourcery.com>

	* infrun.c (handle_inferior_event): Remove write-only local variable
	`sw_single_step_trap_p'.

diff --git a/gdb/infrun.c b/gdb/infrun.c
index 1d8932a..fbf26fc 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -3083,7 +3083,6 @@ handle_inferior_event (struct execution_control_state *ecs)
 {
   struct frame_info *frame;
   struct gdbarch *gdbarch;
-  int sw_single_step_trap_p = 0;
   int stopped_by_watchpoint;
   int stepped_after_stopped_by_watchpoint = 0;
   struct symtab_and_line stop_pc_sal;
@@ -3833,7 +3832,6 @@ handle_inferior_event (struct execution_control_state *ecs)
 	}
       else if (singlestep_breakpoints_inserted_p)
 	{
-	  sw_single_step_trap_p = 1;
 	  ecs->random_signal = 0;
 	}
     }