fixed typo in debug assertion reported by John Mellor-Crummey

llvm-svn: 242043
diff --git a/openmp/runtime/src/kmp_dispatch.cpp b/openmp/runtime/src/kmp_dispatch.cpp
index cf72ab4..65abcf7 100644
--- a/openmp/runtime/src/kmp_dispatch.cpp
+++ b/openmp/runtime/src/kmp_dispatch.cpp
@@ -1389,7 +1389,7 @@
     kmp_info_t                          * th   = __kmp_threads[ gtid ];
     kmp_team_t                          * team = th -> th.th_team;
 
-    KMP_DEBUG_ASSERT( p_last && p_lb && p_ub && p_st ); // AC: these cannot be NULL
+    KMP_DEBUG_ASSERT( p_lb && p_ub && p_st ); // AC: these cannot be NULL
     #ifdef KMP_DEBUG
     {
         const char * buff;