x86: correctly report NR_BANKS in mce_64.c

attached is a no-brainer that makes kernel correctly report
NR_BANKS for MCE. We are right now limited to NR_BANKS==6, but the
error message will use the available number of banks instead of the
defined maximum.

For a Nehalem based system it will print:

"MCE: warning: using only 9 banks"

while the correct message would be

"MCE: warning: using only 6 banks"
Signed-off-by: NPavel Machek <pavel@suse.cz>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/mcheck/mce_64.c

@@ -445,9 +445,9 @@ static void mce_init(void *dummy)
 	rdmsrl(MSR_IA32_MCG_CAP, cap);
 	banks = cap & 0xff;
 	if (banks > MCE_EXTENDED_BANK) {
+		banks = MCE_EXTENDED_BANK;
 		printk(KERN_INFO "MCE: warning: using only %d banks\n",
 		       MCE_EXTENDED_BANK);
-		banks = MCE_EXTENDED_BANK;
 	}
 	/* Use accurate RIP reporting if available. */
 	if ((cap & (1<<9)) && ((cap >> 16) & 0xff) >= 9)