sim/ppc: don't try to print an uninitialized variable

The ppc simulator, in sim_create_inferior, tries to print the function
local entry_point variable before the variable is initialized.

In this commit, I defer the debug print line until the variable has
been initialized.

sim/ppc/sim_calls.c

@@ -161,8 +161,6 @@ sim_create_inferior (SIM_DESC sd,
 		     char * const *envp)
 {
   unsigned_word entry_point;
-  TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
-		    entry_point));
 
   if (simulator == NULL)
     error ("No program loaded");
@@ -172,6 +170,9 @@ sim_create_inferior (SIM_DESC sd,
   else
     entry_point = 0xfff00000; /* ??? */
 
+  TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
+		    entry_point));
+
   psim_init(simulator);
   psim_stack(simulator, argv, envp);