Propagate return value of parse_operating_points()

In decoder_peek_si_internal(), if the parse_operating_points() call
fails, propagate its return value rather than return AOM_CODEC_ERROR.

Change-Id: I569c8ef3c2c0d09d442ea03c0c38e1b6c8672b25

av1/av1_dx_iface.c

diff --git a/av1/av1_dx_iface.c b/av1/av1_dx_iface.c
index 1a2dea3..18dc980 100644
--- a/av1/av1_dx_iface.c
+++ b/av1/av1_dx_iface.c
@@ -310,10 +310,8 @@
         return AOM_CODEC_UNSUP_BITSTREAM;
       }
 
-      if (parse_operating_points(&rb, reduced_still_picture_hdr, si) !=
-          AOM_CODEC_OK) {
-        return AOM_CODEC_ERROR;
-      }
+      status = parse_operating_points(&rb, reduced_still_picture_hdr, si);
+      if (status != AOM_CODEC_OK) return status;
 
       int num_bits_width = aom_rb_read_literal(&rb, 4) + 1;
       int num_bits_height = aom_rb_read_literal(&rb, 4) + 1;