ODROID-COMMON: inputToSysNode: Changed error log.

- Changed fopen error log for making easy to debug.

Signed-off-by: Luke Go <sangch.go@gmail.com>
Change-Id: Icf410b3aa0b6c4e732413a811054c585cade727f
Signed-off-by: steve.jeong <jkhpro1003@gmail.com>
diff --git a/wiringPi/wiringPi.c b/wiringPi/wiringPi.c
index 268fe52..b528a3c 100644
--- a/wiringPi/wiringPi.c
+++ b/wiringPi/wiringPi.c
@@ -279,8 +279,9 @@
 	sprintf(dest, "%s/%s", sysPath, node);
 
 	if((fd = fopen(dest, "w")) == NULL) {
-		printf("Invalid sysnode path\n");
-		return -1;
+		fprintf(stderr, "sys: Unable to open %s: %s\n",
+				dest, strerror (errno));
+		return -errno;
 	}
 	fprintf(fd, "%s\n", data);
 	fclose(fd);