zink: remove invalid scope in bo allocation loop

The braces resulted in the never demoting the heap type
which resulted in an infinite loop if this become a necessity.

Fixes:  eb394f53162ea447fa427740b66af49e5e7ff946
    zink: redesign the allocation try loop to test all heaps

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27446>
1 file changed