nvc0: Remove unnecessary bsp_bo NULL check.

Fix defect reported by Coverity Scan.

Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking bsp_bo suggests that it may be
null, but it has already been dereferenced on all paths leading
to the check.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Part-of: <!10564>
33 jobs for !10564 with fix-cid-1348108 in 8 minutes and 58 seconds (queued for 3 seconds)
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