Bug#35847193 Cluster code fails to compile on Ubuntu23.10

Fix alloc-size-larger-than warning in Qmgr by explicitly only allocate
non-zero sized array.  Compiler can not deduce that that is actually
always the case.

The confusing warning fixed is:

storage/ndb/src/kernel/blocks/qmgr/QmgrInit.cpp: In member function 'initData':
storage/ndb/src/kernel/blocks/qmgr/QmgrInit.cpp:204:60: warning: argument 1 value '18446744073709551615' exceeds maximum
object size 9223372036854775807 [-Walloc-size-larger-than=]
  204 |   receivedProcessInfo = new ProcessInfo[numOfApiAndMgmNodes];
      |                                                            ^
/usr/lib/gcc/x86_64-pc-linux-gnu/13/include/g++-v13/new:128:26: note: in a call to allocation function 'operator new []' declared here
  128 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
      |                          ^

Change-Id: Ie7aea5e8681db1c420d2a0e80d1cda8319f74a2b

Author: zmur

storage/ndb/src/kernel/blocks/qmgr/Qmgr.hpp

@@ -618,7 +618,7 @@ class Qmgr : public SimulatedBlock {
   Timer ka_send_timer;
 
   Int16 processInfoNodeIndex[MAX_NODES];
-  ProcessInfo * receivedProcessInfo;
+  ProcessInfo * receivedProcessInfo = nullptr;
   Uint16 max_api_node_id;
 
   NdbNodeBitmask cfailedNodes;

storage/ndb/src/kernel/blocks/qmgr/QmgrInit.cpp

@@ -201,7 +201,15 @@ void Qmgr::initData()
       break;
     }
   }
-  receivedProcessInfo = new ProcessInfo[numOfApiAndMgmNodes];
+  /*
+   * In reality there must be at least one MGM, API, and, DB node.
+   * And numOfApiAndMgmNodes will be betweeen 2 and 254 (MAX_NODES - 2).
+   *
+   * If in future one can have DB only cluster it is ok to leave
+   * receivedProcessInfo as nullptr since it is only used for MGM and API.
+   */
+  if (likely(numOfApiAndMgmNodes > 0))
+    receivedProcessInfo = new ProcessInfo[numOfApiAndMgmNodes];
 }//Qmgr::initData()
 
 void Qmgr::initRecords()