When a bitmap is empty bitmap_scnlistprintf would leave the buffer uninitialized.
Set it to an empty string in this case.

I didn't see any in normal kernel callers hitting this, but some custom debug
code of mine did.

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux-2.6.24-rc1-hack/lib/bitmap.c
===================================================================
--- linux-2.6.24-rc1-hack.orig/lib/bitmap.c
+++ linux-2.6.24-rc1-hack/lib/bitmap.c
@@ -469,6 +469,10 @@ int bitmap_scnlistprintf(char *buf, unsi
 	/* current bit is 'cur', most recently seen range is [rbot, rtop] */
 	int cur, rbot, rtop;
 
+	if (buflen == 0)
+		return 0;
+	buf[0] = 0;
+
 	rbot = cur = find_first_bit(maskp, nmaskbits);
 	while (cur < nmaskbits) {
 		rtop = cur;
-
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