hamradio: Fix wrong assignment of 'bbc->cfg.loopback'

In file hamradio/baycom_epp.c, the baycom_setmode interface, there
is a problem with improper use of strstr.

Suppose that when modestr="noloopback", both conditions which are
'strstr(modestr,"noloopback")' and 'strstr(modestr,"loopback")'
will be true(not NULL), this lead the bc->cfg.loopback variable
will be first assigned to 0, and then reassigned to 1.

This will cause 'bc->cfg.loopback = 0' will never take effect. That
obviously violates the logic of the code, so adjust the order of
their execution to solve the problem.

Signed-off-by: Meng Tang <tangmeng@uniontech.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220315074851.6456-1-tangmeng@uniontech.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/hamradio/baycom_epp.c

@@ -982,10 +982,10 @@ static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 		bc->cfg.extmodem = 0;
 	if (strstr(modestr,"extmodem"))
 		bc->cfg.extmodem = 1;
-	if (strstr(modestr,"noloopback"))
-		bc->cfg.loopback = 0;
 	if (strstr(modestr,"loopback"))
 		bc->cfg.loopback = 1;
+	if (strstr(modestr, "noloopback"))
+		bc->cfg.loopback = 0;
 	if ((cp = strstr(modestr,"fclk="))) {
 		bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
 		if (bc->cfg.fclk < 1000000)