i3c: master: svc: Fix i3c_master_get_free_addr return check

The return value of i3c_master_get_free_addr is assigned to a variable
with wrong type, so it can't be negative. Use a signed integer for the
return value. If the value is negative, break the process and propagate
the error code.

This commit also fixes the uninitialized symbol 'dyn_addr', reported
by Smatch static checker.

Fixes: 4008a74 ("i3c: master: svc: Fix npcm845 FIFO empty issue")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/029e5ac0-5444-4a8e-bca4-cec55950d2b9@stanley.mountain/
Signed-off-by: Stanley Chu <yschu@nuvoton.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250310023304.2335792-1-yschu@nuvoton.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: stanleychuys

drivers/i3c/master/svc-i3c-master.c

@@ -940,7 +940,7 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 					u8 *addrs, unsigned int *count)
 {
 	u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0;
-	unsigned int dev_nb = 0, last_addr = 0, dyn_addr;
+	unsigned int dev_nb = 0, last_addr = 0, dyn_addr = 0;
 	u32 reg;
 	int ret, i;
 
@@ -998,10 +998,11 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 			 * filling within a few hundred nanoseconds, which is significantly
 			 * faster compared to the 64 SCL clock cycles.
 			 */
-			dyn_addr = i3c_master_get_free_addr(&master->base, last_addr + 1);
-			if (dyn_addr < 0)
-				return -ENOSPC;
+			ret = i3c_master_get_free_addr(&master->base, last_addr + 1);
+			if (ret < 0)
+				break;
 
+			dyn_addr = ret;
 			writel(dyn_addr, master->regs + SVC_I3C_MWDATAB);
 
 			/*