fix a compile warning in ip2main.c

I got the following compile warning in 2.4.22-pre10:

<-- snip -->

...
gcc -D__KERNEL__ -I/home/bunk/linux/kernel-2.4/linux-2.4.22-pre10-full/include - Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing
-fno-common -pipe -mpreferred-stack-boundary=2 -march=k6 -nostdinc -iwithprefix
include -DKBUILD_BASENAME=ip2main -c -o ip2main.o ip2main.c ip2main.c: In function `ip2_init_board':
ip2main.c:991: warning: unused variable `rc'
...

<-- snip -->

The following patch removes this unused variable:

@@ -988,7 +988,7 @@
 static void __init
 ip2_init_board( int boardnum )
 {
-	int i,rc;
+	int i;
 	int nports = 0, nboxes = 0;
 	i2ChanStrPtr pCh;
 	i2eBordStrPtr pB = i2BoardPtrTable[boardnum];

I've tested the compilation with 2.4.22-pre10.

Please apply
Adrian

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed