Skip flushing buffer in error case

If there was a parsing error, the buffer has random stuff in it and
shouldn't be flushed to disk

Introduced in 9b0d3fb

Source/KSCrash/Source/KSCrash/Recording/BSG_KSCrashState.c

@@ -266,11 +266,11 @@ bool bsg_kscrashstate_i_saveState(const BSG_KSCrash_State *const state,
         goto done;
     }
     result = bsg_ksjsonendEncode(&JSONContext);
-
-done:
     if (!bsg_ksfuflushWriteBuffer(fd)) {
         BSG_KSLOG_ERROR("Failed to flush write buffer");
     }
+
+done:
     close(fd);
 
     if (result != BSG_KSJSON_OK) {