fix(io): use simple braces for uuid_null definition

When enabling -Wmissing-field-initializers macro (with W=1), there is
a warning:
drivers/io/io_fip.c:312:40: warning: missing field 'time_mid'
 initializer [-Wmissing-field-initializers]
  312 |         static const uuid_t uuid_null = { {0} }; /* Double
 braces for clang */
      |                                               ^

To avoid that, use simple braces. The compilation with clang is still
working with this change (tested with LLVM-21.1.5).
While at it, as all fields of uuid structure are unsigned, use 0U.

Change-Id: Ib46fe057c308b796bff6ef4dbfcf9854b9703fc1
Signed-off-by: Yann Gautier <yann.gautier@st.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/io/io_fip.c b/drivers/io/io_fip.c
index dd7800507..f06e98a2f 100644
--- a/drivers/io/io_fip.c
+++ b/drivers/io/io_fip.c
@@ -309,7 +309,7 @@ static int fip_file_open(io_dev_info_t *dev_info, const uintptr_t spec,
 	int result;
 	uintptr_t backend_handle;
 	const io_uuid_spec_t *uuid_spec = (io_uuid_spec_t *)spec;
-	static const uuid_t uuid_null = { {0} }; /* Double braces for clang */
+	static const uuid_t uuid_null = { 0U };
 	size_t bytes_read;
 	size_t toc_offset;
 	size_t fip_size;