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				Currently the null check on key is occurring after the strcasecmp on
the key, hence there is a potential null pointer dereference on key.
Fix this by checking if key is null first. Also replace the == 0
check on strcasecmp with just the ! operator.
Detected by CoverityScan, CID#1248787 ("Dereference before null check")
Fixes: 
		
	
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			||
|---|---|---|
| .. | ||
| altera-comp.c | ||
| altera-exprt.h | ||
| altera-jtag.c | ||
| altera-jtag.h | ||
| altera-lpt.c | ||
| altera.c | ||
| Kconfig | ||
| Makefile | ||