scsi: aic7xxx: remove unused redundant variable num_chip_names

Variable num_chip_names is defined but not used, hence it is redundant and can
be removed.

Cleans up clang warning:
'num_chip_names' defined but not used [-Wunused-const-variable=]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aic7xxx/aic79xx_core.c

@@ -52,7 +52,6 @@ static const char *const ahd_chip_names[] =
 	"aic7902",
 	"aic7901A"
 };
-static const u_int num_chip_names = ARRAY_SIZE(ahd_chip_names);
 
 /*
  * Hardware error codes.

drivers/scsi/aic7xxx/aic7xxx_core.c

@@ -61,7 +61,6 @@ static const char *const ahc_chip_names[] = {
 	"aic7892",
 	"aic7899"
 };
-static const u_int num_chip_names = ARRAY_SIZE(ahc_chip_names);
 
 /*
  * Hardware error codes.