[PATCH] of/fdt: remove redundant memset in __unflatten_device_tree()

[Sang-Heon Jeon <ekffu200098@gmail.com>]

All dt_alloc callbacks passed to __unflatten_device_tree() already
return zero-initialized memory.

- kernel_tree_alloc uses kzalloc()
- early_init_dt_alloc_memory_arch() and dt_alloc_memory() both use
  memblock_alloc()

So remove redundant memset after the allocation. No funtional change.

Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
---
dt-test result

[    0.529540] ### dt-test ### start of unittest - you will see error messages
[    0.532758] ### dt-test ### EXPECT \ : Duplicate name in testcase-data, renamed to "duplicate-name#1"
[    0.537608] ### dt-test ### EXPECT / : Duplicate name in testcase-data, renamed to "duplicate-name#1"

...

[    0.781700] ### dt-test ### EXPECT / : OF: resolver: overlay phandle fixup failed: -22
[    0.781718] ### dt-test ### EXPECT / : OF: resolver: node label 'this_label_does_not_exist' not found in live devicetree symbols table
[    0.781945] ### dt-test ### end of unittest - 423 passed, 0 failed

---
Hello, 

While looking into boot information, I found a minor enhancement point.
If I misunderstood anything, please feel free to let me know.

Thank you for taking valuable time to review this work.

Best Regards,
Sang-Heon Jeon
---
 drivers/of/fdt.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index becc855ff8b5..647bff2c4521 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -391,8 +391,6 @@ void *__unflatten_device_tree(const void *blob,
 	if (!mem)
 		return NULL;
 
-	memset(mem, 0, size);
-
 	*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
 
 	pr_debug("  unflattening %p...\n", mem);
-- 
2.43.0