Cleanup stdout flushing

Flushing is not needed since we disabled buffering of stdout.

src/log.c

@@ -175,7 +175,6 @@ void log_close(void)
 {
     if (fp != NULL)
     {
-        fflush(fp);
         fclose(fp);
     }
 }

src/print.c

@@ -30,14 +30,11 @@ char ansi_format[30];
 void print_hex(char c)
 {
   printf("%02x ", (unsigned char) c);
-
-  fflush(stdout);
 }
 
 void print_normal(char c)
 {
   putchar(c);
-  fflush(stdout);
 }
 
 void print_init_ansi_formatting()

src/print.h

@@ -37,7 +37,6 @@ extern char ansi_format[];
     fprintf (stdout, "\r" format "\r\n", ## args); \
   else \
     fprintf (stdout, "\r%s" format ANSI_RESET "\r\n", ansi_format, ## args); \
-  fflush(stdout); \
 }
 
 #define ansi_error_printf(format, args...) \
@@ -55,7 +54,6 @@ extern char ansi_format[];
     fprintf (stdout, format, ## args); \
   else \
     fprintf (stdout, "%s" format ANSI_RESET, ansi_format, ## args); \
-  fflush(stdout); \
 }
 
 #define warning_printf(format, args...) \
@@ -66,7 +64,6 @@ extern char ansi_format[];
     fprintf (stdout, "\r[%s] Warning: " format "\r\n", current_time(), ## args); \
   else \
     ansi_printf("[%s] Warning: " format, current_time(), ## args); \
-  fflush(stdout); \
 }
 
 #define tio_printf(format, args...) \

src/tty.c

@@ -86,7 +86,6 @@ static void optional_local_echo(char c)
         return;
     }
     print(c);
-    fflush(stdout);
     if (option.log)
     {
         log_putc(c);
@@ -255,7 +254,6 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
             case KEY_L:
                 /* Clear screen using ANSI/VT100 escape code */
                 printf("\033c");
-                fflush(stdout);
                 break;
 
             case KEY_Q:
@@ -352,7 +350,7 @@ void stdout_configure(void)
 
     /* Disable line buffering in stdout. This is necessary if we
      * want things like local echo to work correctly. */
-    setbuf(stdout, NULL);
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Save current stdout settings */
     if (tcgetattr(STDOUT_FILENO, &stdout_old) < 0)
@@ -816,7 +814,6 @@ int tty_connect(void)
                         /* Print received tty character to stdout */
                         print(input_char);
                     }
-                    fflush(stdout);
 
                     /* Write to log */
                     if (option.log)