drivers/scsi/psi240i.c: fix an array overrun

This patch fixes an array overrun spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

drivers/scsi/psi240i.c

@@ -329,7 +329,7 @@ static void Irq_Handler (int irq, void *dev_id, struct pt_regs *regs)
 				pinquiryData->AdditionalLength = 35 - 4;
 
 				// Fill in vendor identification fields.
-				for ( z = 0;  z < 20;  z += 2 )
+				for ( z = 0;  z < 8;  z += 2 )
 					{
 					pinquiryData->VendorId[z]	  = ((UCHAR *)identifyData.ModelNumber)[z + 1];
 					pinquiryData->VendorId[z + 1] = ((UCHAR *)identifyData.ModelNumber)[z];