Fix wrong assertions in RPQ-matrix kleene stars

This patch fixes wrong assertions in the RPQ-matrix algorithm
implementation. Some of them expected null whereas there should be
non-null values. Some of them had copy-paste errors within the
consistency checks.

Author: georgiy-belyanin

experimental/algorithm/LAGraph_RPQMatrix.c

@@ -172,14 +172,14 @@ static GrB_Info LAGraph_RpqMatrixKleene(RpqMatrixPlan *plan, char *msg)
 static GrB_Info LAGraph_RpqMatrixKleene_L(RpqMatrixPlan *plan, char *msg)
 {
     LG_ASSERT(plan != NULL, GrB_NULL_POINTER);
-    LG_ASSERT(plan->op == RPQ_MATRIX_OP_KLEENE, GrB_INVALID_VALUE);
+    LG_ASSERT(plan->op == RPQ_MATRIX_OP_KLEENE_L, GrB_INVALID_VALUE);
     LG_ASSERT(plan->res_mat == NULL, GrB_INVALID_VALUE);
 
     RpqMatrixPlan *lhs = plan->lhs;
     RpqMatrixPlan *rhs = plan->rhs;
 
-    LG_ASSERT(lhs == NULL, GrB_NULL_POINTER);
-    LG_ASSERT(rhs == NULL, GrB_NULL_POINTER);
+    LG_ASSERT(lhs != NULL, GrB_NULL_POINTER);
+    LG_ASSERT(rhs != NULL, GrB_NULL_POINTER);
 
     OK(LAGraph_RPQMatrix(rhs, msg));
     OK(LAGraph_RPQMatrix(lhs, msg));
@@ -244,7 +244,7 @@ static GrB_Info LAGraph_RpqMatrixKleene_L(RpqMatrixPlan *plan, char *msg)
 static GrB_Info LAGraph_RpqMatrixKleene_R(RpqMatrixPlan *plan, char *msg)
 {
     LG_ASSERT(plan != NULL, GrB_NULL_POINTER);
-    LG_ASSERT(plan->op == RPQ_MATRIX_OP_KLEENE, GrB_INVALID_VALUE);
+    LG_ASSERT(plan->op == RPQ_MATRIX_OP_KLEENE_R, GrB_INVALID_VALUE);
     LG_ASSERT(plan->res_mat == NULL, GrB_INVALID_VALUE);
 
     RpqMatrixPlan *lhs = plan->lhs;