py/stream: Add mp_stream_close() helper function.
diff --git a/py/stream.c b/py/stream.c
index 9b1d5fd..ebdbe26 100644
--- a/py/stream.c
+++ b/py/stream.c
@@ -31,6 +31,7 @@
 #include "py/nlr.h"
 #include "py/objstr.h"
 #include "py/stream.h"
+#include "py/runtime.h"
 
 #if MICROPY_STREAMS_NON_BLOCK
 #include <errno.h>
@@ -104,6 +105,13 @@
     return stream_p;
 }
 
+mp_obj_t mp_stream_close(mp_obj_t stream) {
+    // TODO: Still consider using ioctl for close
+    mp_obj_t dest[2];
+    mp_load_method(stream, MP_QSTR_close, dest);
+    return mp_call_method_n_kw(0, 0, dest);
+}
+
 STATIC mp_obj_t stream_read_generic(size_t n_args, const mp_obj_t *args, byte flags) {
     const mp_stream_p_t *stream_p = mp_get_stream_raise(args[0], MP_STREAM_OP_READ);
 
diff --git a/py/stream.h b/py/stream.h
index 9202c64..b0f45e2 100644
--- a/py/stream.h
+++ b/py/stream.h
@@ -65,6 +65,7 @@
 #define MP_STREAM_OP_IOCTL (4)
 
 const mp_stream_p_t *mp_get_stream_raise(mp_obj_t self_in, int flags);
+mp_obj_t mp_stream_close(mp_obj_t stream);
 
 // Iterator which uses mp_stream_unbuffered_readline_obj
 mp_obj_t mp_stream_unbuffered_iter(mp_obj_t self);