sim: punt zfree()

The sim keeps track of which allocations are zero-ed internally (via
zalloc) and then calls a helper "zfree" function rather than "free".
But this "zfree" function simply calls "free" itself.  Since I can
see no point in this and it is simply useless overhead, punt it.

The only real change is in hw-alloc.c where we remove the zalloc_p
tracking, and sim-utils.c where zfree is delete.  The rest of the
changes are a simple `sed` from "zfree" to "free".

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim/common/sim-utils.c

@@ -62,12 +62,6 @@ zalloc (unsigned long size)
   return xcalloc (1, size);
 }
 
-void
-zfree (void *data)
-{
-  free (data);
-}
-
 /* Allocate a sim_state struct.  */
 
 SIM_DESC
@@ -118,7 +112,7 @@ sim_state_free (SIM_DESC sd)
   SIM_STATE_FREE (sd);
 #endif
 
-  zfree (sd);
+  free (sd);
 }
 
 /* Return a pointer to the cpu data for CPU_NAME, or NULL if not found.  */