panvk: Don't reset errno in panvk_kmod_zalloc()

We shouldn't reset errno when the allocation succeeds, otherwise we might
be overriding previous allocation failures.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31382>

src/panfrost/vulkan/panvk_instance.c

@@ -118,7 +118,8 @@ panvk_kmod_zalloc(const struct pan_kmod_allocator *allocator, size_t size,
 
    /* We force errno to -ENOMEM on host allocation failures so we can properly
     * report it back as VK_ERROR_OUT_OF_HOST_MEMORY. */
-   errno = obj ? 0 : -ENOMEM;
+   if (!obj)
+      errno = -ENOMEM;
 
    return obj;
 }

src/panfrost/vulkan/panvk_vX_device.c

@@ -42,7 +42,8 @@ panvk_kmod_zalloc(const struct pan_kmod_allocator *allocator, size_t size,
 
    /* We force errno to -ENOMEM on host allocation failures so we can properly
     * report it back as VK_ERROR_OUT_OF_HOST_MEMORY. */
-   errno = obj ? 0 : -ENOMEM;
+   if (!obj)
+      errno = -ENOMEM;
 
    return obj;
 }