app: delete foo sample code

The initial idea behind this code was to showcase documentation. It does
not add any special value to the sample, so remove it. A proper library
can be added in the future.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

Author: gmarull

app/CMakeLists.txt

@@ -12,4 +12,4 @@ project(app LANGUAGES C VERSION 1.0.0)
 configure_file(app_version.h.in ${CMAKE_BINARY_DIR}/app/include/app_version.h)
 target_include_directories(app PRIVATE ${CMAKE_BINARY_DIR}/app/include src)
 
-target_sources(app PRIVATE src/main.c src/foo.c)
+target_sources(app PRIVATE src/main.c)

app/src/foo.c

@@ -7,7 +7,6 @@
 #include <drivers/sensor.h>
 
 #include "app_version.h"
-#include "foo.h"
 
 #include <logging/log.h>
 LOG_MODULE_REGISTER(main, CONFIG_APP_LOG_LEVEL);
@@ -19,12 +18,6 @@ void main(void)
 
 	printk("Zephyr Example Application %s\n", APP_VERSION_STR);
 
-	ret = app_foo_bar();
-	if (ret < 0) {
-		LOG_ERR("app_foo_bar failed (%d)", ret);
-		return;
-	}
-
 	sensor = DEVICE_DT_GET(DT_NODELABEL(examplesensor0));
 	if (!device_is_ready(sensor)) {
 		LOG_ERR("Sensor not ready");