x86: fix off-by-one in find_next_zero_string

Fix an off-by-one error in find_next_zero_string which prevents
allocating the last bit.

[ tglx: arch/x86 adaptation ]

Signed-off-by: Andrew Hastings <abh@cray.com> on behalf of Cray Inc.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/lib/bitstr_64.c

@@ -14,7 +14,7 @@ find_next_zero_string(unsigned long *bitmap, long start, long nbits, int len)
 
 	/* could test bitsliced, but it's hardly worth it */
 	end = n+len;
-	if (end >= nbits) 
+	if (end > nbits)
 		return -1; 
 	for (i = n+1; i < end; i++) { 
 		if (test_bit(i, bitmap)) {