Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/ruby/ext/google/protobuf_c/upb.c

Index: third_party/protobuf/ruby/ext/google/protobuf_c/upb.c
diff --git a/third_party/protobuf/ruby/ext/google/protobuf_c/upb.c b/third_party/protobuf/ruby/ext/google/protobuf_c/upb.c
index 544ebc04175aeb3d741ed319a6af8c7d9062b4bb..74a2a1db30a325a87695db6428700419d292ba69 100644
--- a/third_party/protobuf/ruby/ext/google/protobuf_c/upb.c
+++ b/third_party/protobuf/ruby/ext/google/protobuf_c/upb.c
@@ -11076,8 +11076,8 @@ static bool end_stringval(upb_json_parser *p) {
 
     case UPB_TYPE_STRING: {
       upb_selector_t sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
-      p->top--;
       upb_sink_endstr(&p->top->sink, sel);
+      p->top--;
       break;
     }
 
@@ -11175,7 +11175,7 @@ static bool parse_mapentry_key(upb_json_parser *p) {
       sel = getsel_for_handlertype(p, UPB_HANDLER_STRING);
       upb_sink_putstring(&subsink, sel, buf, len, NULL);
       sel = getsel_for_handlertype(p, UPB_HANDLER_ENDSTR);
-      upb_sink_endstr(&p->top->sink, sel);
+      upb_sink_endstr(&subsink, sel);
       multipart_end(p);
       break;
     }