examples: don't enable buffering on stdout in console examples

newlib uses significantly more stack space when printing to an
unbuffered stream. To reduce the amount of stack space required to
use the console, don’t disable buffering. linenoise should support
unbuffered stdout instead.

examples/ethernet/iperf/main/iperf_example_main.c

@@ -56,9 +56,8 @@ static void initialize_nvs()
 
 static void initialize_console()
 {
-    /* Disable buffering on stdin and stdout */
+    /* Disable buffering on stdin */
     setvbuf(stdin, NULL, _IONBF, 0);
-    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
     esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);

examples/peripherals/i2c/i2c_tools/main/i2ctools_example_main.c

@@ -56,9 +56,8 @@ static void initialize_nvs()
 
 static void initialize_console()
 {
-    /* Disable buffering on stdin and stdout */
+    /* Disable buffering on stdin */
     setvbuf(stdin, NULL, _IONBF, 0);
-    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
     esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);

examples/system/console/main/console_example_main.c

@@ -59,9 +59,8 @@ static void initialize_nvs()
 
 static void initialize_console()
 {
-    /* Disable buffering on stdin and stdout */
+    /* Disable buffering on stdin */
     setvbuf(stdin, NULL, _IONBF, 0);
-    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
     esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);

examples/wifi/iperf/main/iperf_example_main.c

@@ -28,9 +28,8 @@
 
 static void initialize_console()
 {
-    /* Disable buffering on stdin and stdout */
+    /* Disable buffering on stdin */
     setvbuf(stdin, NULL, _IONBF, 0);
-    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
     esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);

examples/wifi/simple_sniffer/main/simple_sniffer_example_main.c

@@ -75,9 +75,8 @@ static void initialize_wifi()
 /* Initialize console component */
 static void initialize_console()
 {
-    /* Disable buffering on stdin and stdout */
+    /* Disable buffering on stdin */
     setvbuf(stdin, NULL, _IONBF, 0);
-    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
     esp_vfs_dev_uart_set_rx_line_endings(ESP_LINE_ENDINGS_CR);