[PATCH] bcache: fix -Wunterminated-string-initialization from incoming gcc-15

When compiling with gcc version 15.0.0 20241204 (experimental),
I've noticed the following warning:

drivers/md/bcache/super.c: In function 'uuid_find_empty':
drivers/md/bcache/super.c:549:43: warning: initializer-string for array
of 'char' is too long [-Wunterminated-string-initialization]
  549 |         static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
      |                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Since C string constants are null-byte terminated by default,
constant zero initializer of 'const char[16]' should have 15
bytes rather than 16.

Fixes: cafe56359144 ("bcache: A block layer cache")
Signed-off-by: Dmitry Antipov <[email protected]>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e7abfdd77c3b..c47a9ac031bd 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -546,7 +546,7 @@ static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid)
 
 static struct uuid_entry *uuid_find_empty(struct cache_set *c)
 {
-	static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+	static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
 
 	return uuid_find(c, zero_uuid);
 }
-- 
2.47.1