[][kernel][mt7986][spi][spi-calibration: Fix probe flow error if flash devices don't need calibration]

[Description]
Fix probe flow error if flash devices don't need calibration

[Release-log]
N/A

Change-Id: I802edc6c7a5eceb5ec4109900fe123073d993ec2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7368325
1 file changed