checkpatch.pl false positive? "ERROR: do not use assignment in if condition"

[Tilman Schmidt <tilman@imap.cc>]

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The command
./scripts/checkpatch.pl -f drivers/isdn/gigaset/bas-gigaset.c 
produces a lot of "ERROR" messages like these:

ERROR: do not use assignment in if condition
#608: FILE: isdn/gigaset/bas-gigaset.c:608:
+       if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {

ERROR: do not use assignment in if condition
#745: FILE: isdn/gigaset/bas-gigaset.c:745:
+               if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {

ERROR: do not use assignment in if condition
#753: FILE: isdn/gigaset/bas-gigaset.c:753:
+               if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {

As far as I can see there's nothing wrong with these lines. In particular,
I cannot find anything in Documentation/CodingStyle that would prohibit an
assignment inside an 'if' condition.

PS: I know the file has other problems. That's why I'm trying to
checkpatch it in the first place.

-- 
Tilman Schmidt                    E-Mail: tilman@imap.cc
Bonn, Germany
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