xfs: fix spacing style issues in xfs_alloc.c
Fix checkpatch.pl errors regarding missing spaces around assignment
operators in xfs_alloc_compute_diff() and xfs_alloc_fixup_trees().
Adhere to the Linux kernel coding style by ensuring spaces are placed
around the assignment operator '='.
Signed-off-by: Shin Seong-jun <shinsj4653@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
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