Revert "FROMLIST: misc: fastrpc: Allow fastrpc_buf_free() to accept NULL"

This change corresponds to the v4 version shared with the
upstream community.

Revert it to apply the complete v6 revision, which includes additional
fixes and updates not present in the earlier version.

This reverts commit e0ba718.

Signed-off-by: Vinayak Katoch <vkatoch@qti.qualcomm.com>

Author: quic-vkatoch

drivers/misc/fastrpc.c

@@ -585,7 +585,8 @@ static void fastrpc_context_free(struct kref *ref)
 	for (i = 0; i < ctx->nbufs; i++)
 		fastrpc_map_put(ctx->maps[i]);
 
-	fastrpc_buf_free(ctx->buf);
+	if (ctx->buf)
+		fastrpc_buf_free(ctx->buf);
 
 	spin_lock_irqsave(&cctx->lock, flags);
 	idr_remove(&cctx->ctx_idr, FIELD_GET(FASTRPC_CTXID_MASK, ctx->ctxid));
@@ -1728,7 +1729,8 @@ static int fastrpc_device_release(struct inode *inode, struct file *file)
 	list_del(&fl->user);
 	spin_unlock_irqrestore(&cctx->lock, flags);
 
-	fastrpc_buf_free(fl->init_mem);
+	if (fl->init_mem)
+		fastrpc_buf_free(fl->init_mem);
 
 	list_for_each_entry_safe(ctx, n, &fl->pending, node) {
 		list_del(&ctx->node);