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picture: fix default_picture_allocator() return value on failure

The doxy for Dav1dPicAllocator.alloc_picture_callback() states it must be a
negative errno value.
Propagate it as well in picture_alloc_with_edges().

--- a/src/picture.c

+++ b/src/picture.c

@@ -62,7 +62,7 @@

     uint8_t *data = dav1d_alloc_aligned(pic_size + DAV1D_PICTURE_ALIGNMENT,

                                         DAV1D_PICTURE_ALIGNMENT);

     if (data == NULL) {

-        return -1;

+        return -ENOMEM;

     }

     p->data[0] = data;

@@ -131,7 +131,7 @@

     int res = p_allocator->alloc_picture_callback(p, p_allocator->cookie);

     if (res < 0) {

         free(pic_ctx);

-        return -ENOMEM;

+        return res;

     }

     pic_ctx->allocator = *p_allocator;