Bluetooth: Fix false-positive "uninitialized" compiler warning

Some gcc versions don't seem to be able to properly track the flow of
the smp_cmd_pairing_random() function and end up causing the following
types of (false-positive) warnings:

smp.c:1995:6: warning: ‘nb’ may be used uninitialized in this function [-Wmaybe-uninitialized]
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
smp.c:1995:6: warning: ‘na’ may be used uninitialized in this function [-Wmaybe-uninitialized]
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
^
smp.c:1995:6: warning: ‘pkbx’ may be used uninitialized in this function [-Wmaybe-uninitialized]
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
^
smp.c:1995:6: warning: ‘pkax’ may be used uninitialized in this function [-Wmaybe-uninitialized]
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);

This patch fixes the issue by moving the pkax/pkbx and na/nb
initialization earlier in the function.

Signed-off-by: Johan Hedberg <[e-mail]>
Signed-off-by: Marcel Holtmann <[e-mail]>

net/bluetooth/smp.c

···
 	if (!test_bit(SMP_FLAG_SC, &smp->flags))
 		return smp_random(smp);
 
+	if (hcon->out) {
+		pkax = smp->local_pk;
+		pkbx = smp->remote_pk;
+		na   = smp->prnd;
+		nb   = smp->rrnd;
+	} else {
+		pkax = smp->remote_pk;
+		pkbx = smp->local_pk;
+		na   = smp->rrnd;
+		nb   = smp->prnd;
+	}
+
 	if (smp->method == REQ_OOB) {
 		if (!hcon->out)
 			smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
···
 
 		if (memcmp(smp->pcnf, cfm, 16))
 			return SMP_CONFIRM_FAILED;
-
-		pkax = smp->local_pk;
-		pkbx = smp->remote_pk;
-		na   = smp->prnd;
-		nb   = smp->rrnd;
 	} else {
 		smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
 			     smp->prnd);
 		SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
-
-		pkax = smp->remote_pk;
-		pkbx = smp->local_pk;
-		na   = smp->rrnd;
-		nb   = smp->prnd;
 	}
 
 mackey_and_ltk: