only use tpreserved when it's not NULL #2132

src/lib/notcurses.c

@@ -1258,9 +1258,11 @@ notcurses* notcurses_core_init(const notcurses_options* opts, FILE* outfp){
 
 err:
   logpanic("Alas, you will not be going to space today.\n");
-  // FIXME looks like we have some memory leaks on this error path?
   fbuf_free(&ret->rstate.f);
-  (void)tcsetattr(ret->tcache.ttyfd, TCSAFLUSH, ret->tcache.tpreserved);
+  if(ret->tcache.tpreserved){
+    (void)tcsetattr(ret->tcache.ttyfd, TCSAFLUSH, ret->tcache.tpreserved);
+    free(ret->tcache.tpreserved);
+  }
   drop_signals(ret);
   del_curterm(cur_term);
   pthread_mutex_destroy(&ret->stats.lock);

src/lib/termdesc.c

@@ -921,7 +921,7 @@ int interrogate_terminfo(tinfo* ti, const char* termtype, FILE* out, unsigned ut
   return 0;
 
 err:
-  if(ti->ttyfd >= 0){
+  if(ti->tpreserved){
     tcsetattr(ti->ttyfd, TCSANOW, ti->tpreserved);
   }
   free(ti->tpreserved);