libceph: Fix base64-decoding when input ends in newline.

It used to return -EINVAL because it thought the end was not aligned
to 4 bytes.

Clean up superfluous src < end test in if, the while itself guarantees
that.
Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>

net/ceph/armor.c

@@ -78,8 +78,10 @@ int ceph_unarmor(char *dst, const char *src, const char *end)
 	while (src < end) {
 		int a, b, c, d;
 
-		if (src < end && src[0] == '\n')
+		if (src[0] == '\n') {
 			src++;
+			continue;
+		}
 		if (src + 4 > end)
 			return -EINVAL;
 		a = decode_bits(src[0]);