Update src/sparse/stdlib_sparse_kinds.fypp

Co-authored-by: Jeremie Vandenplas <jeremie.vandenplas@gmail.com>

Author: jalvesz

src/sparse/stdlib_sparse_kinds.fypp

@@ -375,7 +375,7 @@ contains
         call move_alloc(from=temp_idx,to=self%col)
 
         if(.not.allocated(self%rowptr)) then
-            allocate(temp_idx(num_brows+1) , source = 0 )
+            allocate(temp_idx(num_brows+1) , source = 0_ilp )
         else
             allocate(temp_idx(num_brows+1) , source = self%rowptr )
         end if