[PATCH] xarray: unlock on error in xa_alloc()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

We need to unlock on this error path.

Fixes: 29a6bfc32eb2 ("xarray: Track free entries in an XArray")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---

There "UINT_MAX + 1" is an integer overflow and is equal to zero but I
don't know what was intended there.

diff --git a/lib/xarray.c b/lib/xarray.c
index be10039caaed..a27fdb381f64 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1474,8 +1474,10 @@ int xa_alloc(struct xarray *xa, u32 *id, void *entry, gfp_t gfp)
 		xas.xa_index = 0;
 		xas_lock(&xas);
 		xas_find_tagged(&xas, UINT_MAX, XA_FREE_TAG);
-		if (xas.xa_node == XAS_BOUNDS && xas.xa_index == UINT_MAX + 1)
+		if (xas.xa_node == XAS_BOUNDS && xas.xa_index == UINT_MAX + 1) {
+			xas_unlock(&xas);
 			return -ENOSPC;
+		}
 		*id = xas.xa_index;
 		xas_store(&xas, entry);
 		xas_clear_tag(&xas, XA_FREE_TAG);