net: wireless: bcmdhd: fix for debug ring kernel panic

fix for corner case when ring buffer read/write pointer
wrap arounded and request wrong sized one.

bug=31111287

Change-Id: I178a02e4fe79f707165a81a5402183f6b6bab0ce
Signed-off-by: Insun Song <insun.song@broadcom.com>
3 files changed