fixup: smart: uninitialized buffer on mount(2)

The `struct stat` object used inside mount(2) is uninitialized, which
can lead to undefined behavior during running

Changes:
- Set zero to buffer before calling to stat()

Signed-off-by: Shell <[email protected]>

Author: polarvid

Diff for: components/lwp/lwp_syscall.c

@@ -5805,8 +5805,6 @@ sysret_t sys_mount(char *source, char *target,
         copy_source = NULL;
     }
 
-    struct stat buf;
-
     if (copy_source && stat(copy_source, &buf) && S_ISBLK(buf.st_mode))
     {
         char *dev_fullpath = dfs_normalize_path(RT_NULL, copy_source);