[PATCH 2.2] fix ap_get_scoreboard_*

[Joe Orton]

The limit checking is broken in 2.2's ap_get_scoreboard_*.  This was 
fixed in 2.4 in http://svn.apache.org/viewvc?view=revision&revision=417252

Patch below backports that, plus fixes the additional broken comparison 
in ap_get_scoreboard_lb(), discovered by Hisanobu Okuda.

Can I get +1s for this for 2.2?

Submitted by: wrowe, jorton

Index: server/scoreboard.c
===================================================================
--- server/scoreboard.c (revision 1799181)
+++ server/scoreboard.c (working copy)
@@ -503,8 +503,8 @@
 
 AP_DECLARE(worker_score *) ap_get_scoreboard_worker(int x, int y)
 {
-    if (((x < 0) || (server_limit < x)) ||
-        ((y < 0) || (thread_limit < y))) {
+    if (((x < 0) || (x >= server_limit)) ||
+        ((y < 0) || (y >= thread_limit))) {
         return(NULL); /* Out of range */
     }
     return &ap_scoreboard_image->servers[x][y];
@@ -527,7 +527,7 @@
 
 AP_DECLARE(process_score *) ap_get_scoreboard_process(int x)
 {
-    if ((x < 0) || (server_limit < x)) {
+    if ((x < 0) || (x >= server_limit)) {
         return(NULL); /* Out of range */
     }
     return &ap_scoreboard_image->parent[x];
@@ -540,7 +540,7 @@
 
 AP_DECLARE(lb_score *) ap_get_scoreboard_lb(int lb_num)
 {
-    if (((lb_num < 0) || (lb_limit < lb_num))) {
+    if (lb_num < 0 || lb_num >= lb_limit) {
         return(NULL); /* Out of range */
     }
     return &ap_scoreboard_image->balancers[lb_num];