ndb: fix solaris (etc) ndb startup problem in mysql-test-run

ndb/src/common/util/NdbOut.cpp:
  avoid printf("%s", (char*)0)

ndb/src/common/util/NdbOut.cpp

@@ -54,7 +54,7 @@ NdbOut&
 NdbOut::operator<<(unsigned long int v) { return *this << (Uint64) v; }
 
 NdbOut& 
-NdbOut::operator<<(const char* val){ m_out->print("%s", val); return * this; }
+NdbOut::operator<<(const char* val){ m_out->print("%s", val ? val : "(null)"); return * this; }
 NdbOut& 
 NdbOut::operator<<(const void* val){ m_out->print("%p", val); return * this; }
 NdbOut&