various warning/errorwarning fixes for gcc47

. warnings (sometimes promoted to errors) in servers/ and kernel/
 . -Os for ext2 boot module to make it small enough

servers/rs/manager.c

@@ -1247,12 +1247,6 @@ int *length;
 void share_exec(rp_dst, rp_src)
 struct rproc *rp_dst, *rp_src;
 {
-  struct rprocpub *rpub_src;
-  struct rprocpub *rpub_dst;
-
-  rpub_src = rp_src->r_pub;
-  rpub_dst = rp_dst->r_pub;
-
   if(rs_verbose)
       printf("RS: %s shares exec image with %s\n",
           srv_to_string(rp_dst), srv_to_string(rp_src));

servers/rs/request.c

@@ -89,7 +89,6 @@ message *m_ptr;					/* request message pointer */
 int do_down(message *m_ptr)
 {
   register struct rproc *rp;
-  register struct rprocpub *rpub;
   int s;
   char label[RS_MAX_LABEL_LEN];
 
@@ -107,7 +106,6 @@ int do_down(message *m_ptr)
           printf("RS: do_down: service '%s' not found\n", label);
       return(ESRCH);
   }
-  rpub = rp->r_pub;
 
   /* Check if the call can be allowed. */
   if((s = check_call_permission(m_ptr->m_source, RS_DOWN, rp)) != OK)
@@ -324,7 +322,6 @@ int do_edit(message *m_ptr)
 int do_refresh(message *m_ptr)
 {
   register struct rproc *rp;
-  register struct rprocpub *rpub;
   int s;
   char label[RS_MAX_LABEL_LEN];
 
@@ -342,7 +339,6 @@ int do_refresh(message *m_ptr)
           printf("RS: do_refresh: service '%s' not found\n", label);
       return(ESRCH);
   }
-  rpub = rp->r_pub;
 
   /* Check if the call can be allowed. */
   if((s = check_call_permission(m_ptr->m_source, RS_REFRESH, rp)) != OK)
@@ -833,7 +829,6 @@ void do_sigchld()
   int status;
   struct rproc *rp;
   struct rproc **rps;
-  struct rprocpub *rpub;
   int i, nr_rps;
 
   if(rs_verbose)
@@ -842,7 +837,6 @@ void do_sigchld()
   while ( (pid = waitpid(-1, &status, WNOHANG)) != 0 ) {
       rp = lookup_slot_by_pid(pid);
       if(rp != NULL) {
-          rpub = rp->r_pub;
 
           if(rs_verbose)
               printf("RS: %s exited via another signal manager\n",

servers/rs/utility.c

@@ -180,10 +180,6 @@ struct rproc *rp;				/* pointer to process slot */
 int code;					/* status code */
 {
 /* If a caller is waiting for a reply, unblock it. */
-  struct rprocpub *rpub;
-
-  rpub = rp->r_pub;
-
   if(rp->r_flags & RS_LATEREPLY) {
       message m;
       m.m_type = code;