disp: msm: sde: add snapshot of SDE from 4.14 to 4.19

This change takes a snapshot from 4.14 to 4.19 as of
commit 47d149c31967 ("drm/msm/sde: Add null pointer
sanity checks").

Change-Id: Ib40428c562c3561c8a20d9849f16d13151496005
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/sde/sde_hw_sspp.c

@@ -157,11 +157,12 @@ static inline int _sspp_subblk_offset(struct sde_hw_pipe *ctx,
 		u32 *idx)
 {
 	int rc = 0;
-	const struct sde_sspp_sub_blks *sblk = ctx->cap->sblk;
+	const struct sde_sspp_sub_blks *sblk;
 
 	if (!ctx)
 		return -EINVAL;
 
+	sblk = ctx->cap->sblk;
 	switch (s_id) {
 	case SDE_SSPP_SRC:
 		*idx = sblk->src_blk.base;