BUG null dereference in driver ./drivers/net/3c507.c

[Alexander Strakh]

	KERNEL_VERSION: 2.6.32
	SUBJECT: null dereference aftre check
	DESCRIBE:
	In driver drivers/net/3c507.c in function Iirqreturn_t el16_interrupt:

1. If in line 555 dev = NULL then we goto line 556
2. In line 556 we have null dereference because pr_err called with dev->name 
in third parameter.

 555        if (dev == NULL) {
 556                pr_err("%s: net_interrupt(): irq %d for unknown device.
\n",
 557                        dev->name, irq);
 558                return IRQ_NONE;
 559        }

Found by Linux Device Drivers Verification Project (Svace Detector)
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