NEW: add the network cable connect status check to avoid error log

Signed-off-by: DJI-Martin <DJI-Martin@dji.com>

samples/sample_c/module_sample/utils/util_misc.h

@@ -47,6 +47,7 @@ extern "C" {
 /* Exported functions --------------------------------------------------------*/
 T_DjiReturnCode DjiUserUtil_GetCurrentFileDirPath(const char *filePath, uint32_t pathBufferSize, char *dirPath);
 void DjiUserUtil_PrintProgressBar(uint16_t currentProgress, uint16_t totalProgress, char *userData);
+T_DjiReturnCode DjiUserUtil_RunSystemCmd(const char *systemCmdStr);
 
 #ifdef __cplusplus
 }