i3c: adi: Fix confusing cleanup.h syntax

Initializing automatic __free variables to NULL without need (e.g.
branches with different allocations), followed by actual allocation is
in contrary to explicit coding rules guiding cleanup.h:

"Given that the "__free(...) = NULL" pattern for variables defined at
the top of the function poses this potential interdependency problem the
recommendation is to always define and assign variables in one statement
and not group variable definitions at the top of the function when
__free() is used."

Code does not have a bug, but is less readable and uses discouraged
coding practice, so fix that by moving declaration to the place of
assignment.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/i3c/master/adi-i3c-master.c

···
 				       struct i3c_ccc_cmd *cmd)
 {
 	struct adi_i3c_master *master = to_adi_i3c_master(m);
-	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
 	struct adi_i3c_cmd *ccmd;
 
-	xfer = adi_i3c_master_alloc_xfer(master, 1);
+	struct adi_i3c_xfer *xfer __free(kfree) = adi_i3c_master_alloc_xfer(master, 1);
 	if (!xfer)
 		return -ENOMEM;
 
···
 {
 	struct i3c_master_controller *m = i3c_dev_get_master(dev);
 	struct adi_i3c_master *master = to_adi_i3c_master(m);
-	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
 	int i, ret;
 
 	if (!nxfers)
 		return 0;
 
-	xfer = adi_i3c_master_alloc_xfer(master, nxfers);
+	struct adi_i3c_xfer *xfer __free(kfree) = adi_i3c_master_alloc_xfer(master, nxfers);
 	if (!xfer)
 		return -ENOMEM;
 
···
 {
 	struct i3c_master_controller *m = i2c_dev_get_master(dev);
 	struct adi_i3c_master *master = to_adi_i3c_master(m);
-	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
 	int i;
 
 	if (!nxfers)
···
 		if (xfers[i].flags & I2C_M_TEN)
 			return -EOPNOTSUPP;
 	}
-	xfer = adi_i3c_master_alloc_xfer(master, nxfers);
+
+	struct adi_i3c_xfer *xfer __free(kfree) = adi_i3c_master_alloc_xfer(master, nxfers);
 	if (!xfer)
 		return -ENOMEM;