feat: fix realpath return errno issue

Signed-off-by: Nyangjian <jianyang@bestechnic.com>
Change-Id: I1ee933bb572c35a9406ea7f449608ec47ef1a21b

porting/liteos_m/kernel/src/misc/realpath.c

@@ -71,7 +71,7 @@ char *realpath(const char *__restrict path, char *__restrict resolved_path)
 
     // LiteOS-M file system uses abs path, so we just stat path and strcpy it.
     if (stat(path, &st) < 0) {
-        errno = EINVAL;
+        errno = ENOENT;
         return NULL;
     }