staging: exfat: check for null return from call to FAT_getblk
A call to FAT_getblk is missing a null return check which can lead to a null pointer dereference. Fix this by adding a null check to match all the other FAT_getblk return sanity checks. Addresses-Coverity: ("Dereference null return") Fixes: c48c9f7f ("staging: exfat: add exfat filesystem code to staging") Signed-off-by: NColin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20190830175050.12706-1-colin.king@canonical.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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