add error checking in dropzeros!

Author: abhinavmehndiratta

src/Interface/Object_Methods/Matrix_Methods.jl

@@ -448,6 +448,12 @@ Remove all zero entries from GraphBLAS matrix.
 """
 function dropzeros!(A::GrB_Matrix)
     outp_replace_desc = GrB_Descriptor(Dict(GrB_OUTP => GrB_REPLACE))
-    GrB_assign(A, A, GrB_NULL, A, GrB_ALL, 0, GrB_ALL, 0, outp_replace_desc)
-    GrB_free(outp_replace_desc)
+    res = GrB_assign(A, A, GrB_NULL, A, GrB_ALL, 0, GrB_ALL, 0, outp_replace_desc)
+    if res != GrB_SUCCESS
+        error(res)
+    end
+    res = GrB_free(outp_replace_desc)
+    if res != GrB_SUCCESS
+        error(res)
+    end
 end

src/Interface/Object_Methods/Vector_Methods.jl

@@ -347,6 +347,12 @@ Remove all zero entries from GraphBLAS vector.
 """
 function dropzeros!(v::GrB_Vector)
     outp_replace_desc = GrB_Descriptor(Dict(GrB_OUTP => GrB_REPLACE))
-    GrB_assign(v, v, GrB_NULL, v, GrB_ALL, 0, outp_replace_desc)
-    GrB_free(outp_replace_desc)
+    res = GrB_assign(v, v, GrB_NULL, v, GrB_ALL, 0, outp_replace_desc)
+    if res != GrB_SUCCESS
+        error(res)
+    end
+    res = GrB_free(outp_replace_desc)
+    if res != GrB_SUCCESS
+        error(res)
+    end
 end