Return BSPatch value (previously, was ignored).

courgette/third_party/bsdiff/bsdiff_apply.cc

Index: courgette/third_party/bsdiff/bsdiff_apply.cc
diff --git a/courgette/third_party/bsdiff/bsdiff_apply.cc b/courgette/third_party/bsdiff/bsdiff_apply.cc
index 8d43c5d5175856c577d8c07c60f3fea7b7056639..76bb7d0baf6723e6723d6731496402da6fdab1ce 100644
--- a/courgette/third_party/bsdiff/bsdiff_apply.cc
+++ b/courgette/third_party/bsdiff/bsdiff_apply.cc
@@ -185,9 +185,7 @@ BSDiffStatus ApplyBinaryPatch(SourceStream* old_stream,
   if (CalculateCrc(old_start, old_size) != header.scrc32)
     return CRC_ERROR;
 
-  MBS_ApplyPatch(&header, patch_stream, old_start, old_size, new_stream);
-
-  return OK;
+  return MBS_ApplyPatch(&header, patch_stream, old_start, old_size, new_stream);
 }
 
 BSDiffStatus ApplyBinaryPatch(base::File old_file,