fix invalid usage of stderr and incorrect formatting

src/friendlist.c

@@ -1031,7 +1031,7 @@ static void friendlist_onDraw(ToxWindow *self, Tox *m)
     wprintw(self->window, " Online: ");
     wattroff(self->window, A_BOLD);
 
-    wprintw(self->window, "%d/%d \n\n", Friends.num_online, Friends.num_friends);
+    wprintw(self->window, "%zu/%zu \n\n", Friends.num_online, Friends.num_friends);
 
     if ((y2 - FLIST_OFST) <= 0) {
         return;

src/line_info.c

@@ -391,7 +391,7 @@ void line_info_print(ToxWindow *self)
                     }
                 }
 
-                wprintw(win, "\n", line->msg);
+                wprintw(win, "\n");
                 break;
 
             case OUT_ACTION_READ:

src/toxic.c

@@ -129,12 +129,11 @@ static void catch_SIGSEGV(int sig)
 {
     UNUSED_VAR(sig);
 
-    if (!freopen("/dev/tty", "w", stderr)) {    // make sure stderr is enabled since we may have disabled it
-        fprintf(stderr, "Warning: Failed to enable stderr\n");
+    if (freopen("/dev/tty", "w", stderr)) {    // make sure stderr is enabled since we may have disabled it
+        fprintf(stderr, "Caught SIGSEGV: Aborting toxic session.\n");
     }
 
     endwin();
-    fprintf(stderr, "Caught SIGSEGV: Aborting toxic session.\n");
     exit(EXIT_FAILURE);
 }
 
@@ -216,12 +215,11 @@ void exit_toxic_err(const char *errmsg, int errcode)
 {
     free_global_data();
 
-    if (!freopen("/dev/tty", "w", stderr)) {
-        fprintf(stderr, "Warning: Failed to open stderr\n");
+    if (freopen("/dev/tty", "w", stderr)) {
+        fprintf(stderr, "Toxic session aborted with error code %d (%s)\n", errcode, errmsg);
     }
 
     endwin();
-    fprintf(stderr, "Toxic session aborted with error code %d (%s)\n", errcode, errmsg);
     exit(EXIT_FAILURE);
 }