regcache: flat: Remove unneeded check and error message for -ENOMEM

There is a convention in the kernel to avoid error messages
in the cases of -ENOMEM errors. Besides that, the idea behind
using struct_size() and other macros from overflow.h is
to saturate the size that the following allocation call will
definitely fail, hence the check and the error messaging added
in regcache_flat_init() are redundant. Remove them.

Acked-by: Sander Vanheule <sander@svanheule.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20251031080540.3970776-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: andy-shev

drivers/base/regmap/regcache-flat.c

@@ -30,22 +30,14 @@ struct regcache_flat_data {
 static int regcache_flat_init(struct regmap *map)
 {
 	int i;
-	size_t cache_data_size;
 	unsigned int cache_size;
 	struct regcache_flat_data *cache;
 
 	if (!map || map->reg_stride_order < 0 || !map->max_register_is_set)
 		return -EINVAL;
 
 	cache_size = regcache_flat_get_index(map, map->max_register) + 1;
-	cache_data_size = struct_size(cache, data, cache_size);
-
-	if (cache_data_size == SIZE_MAX) {
-		dev_err(map->dev, "cannot allocate regmap cache");
-		return -ENOMEM;
-	}
-
-	cache = kzalloc(cache_data_size, map->alloc_flags);
+	cache = kzalloc(struct_size(cache, data, cache_size), map->alloc_flags);
 	if (!cache)
 		return -ENOMEM;