[PATCH 2/8] jfs: fix gcc9 error address-of-packed-member

[Michael Chang]

Change the le_to_cpu16_copy function to use void* type as its second
argument to silence the warning. The pointer is later type casted to
grub_uint16_t* and use grub_get_unaligned16 for safely deferencing it
for the value.

The solved gcc9 error like this.

[   60s] ../grub-core/fs/jfs.c: In function 'grub_jfs_getent':
[   60s] ../grub-core/fs/jfs.c:557:44: error: taking address of packed member 
of 'struct grub_jfs_leaf_dirent' may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
[   60s]   557 |   le_to_cpu16_copy (filename + strpos, leaf->namepart, len < 
diro->data->namecomponentlen ? len
[   60s]       |                                        ~~~~^~~~~~~~~~
[   60s] ../grub-core/fs/jfs.c:570:48: error: taking address of packed member 
of 'struct grub_jfs_leaf_next_dirent' may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
[   60s]   570 |  le_to_cpu16_copy (filename + strpos, next_leaf->namepart, len 
< 15 ? len : 15);
[   60s]       |                                       ~~~~~~~~~^~~~~~~~~~
[   60s] cc1: all warnings being treated as errors

Signed-off-by: Michael Chang <address@hidden>
---
 grub-core/fs/jfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/grub-core/fs/jfs.c b/grub-core/fs/jfs.c
index 09bc5608d..f1fe72192 100644
--- a/grub-core/fs/jfs.c
+++ b/grub-core/fs/jfs.c
@@ -499,10 +499,11 @@ grub_jfs_closedir (struct grub_jfs_diropen *diro)
 }
 
 static void
-le_to_cpu16_copy (grub_uint16_t *out, grub_uint16_t *in, grub_size_t len)
+le_to_cpu16_copy (grub_uint16_t *out, const void *in, grub_size_t len)
 {
+  const grub_uint16_t *p = (const grub_uint16_t *)in;
   while (len--)
-    *out++ = grub_le_to_cpu16 (*in++);
+    *out++ = grub_le_to_cpu16 (grub_get_unaligned16 (p++));
 }
 
 
-- 
2.16.4