slsm: fix invalid krealloc parameter

Thanks afl.

security/slsm/tree.c

@@ -206,7 +206,7 @@ int slsm_str_append(struct slsm_str *buf, const char *fmt, ...) {
 		if (new_size > (ssize_t)new_size)
 			return -EFBIG;
 
-		new_buf = krealloc(&buf->buf, new_size, GFP_KERNEL);
+		new_buf = krealloc(buf->buf, new_size, GFP_KERNEL);
 		if (!new_buf)
 			return -ENOMEM;