drm/bridge: sil_sii8620: initialize return of sii8620_readb

clang static analysis flags this error

sil-sii8620.c:184:2: warning: Undefined or garbage value
  returned to caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~

sii8620_readb calls sii8620_read_buf.
sii8620_read_buf can return without setting its output
pararmeter 'ret'.

So initialize ret.

Fixes: ce6e153 ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Tom Rix

drivers/gpu/drm/bridge/sil-sii8620.c

@@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
 
 static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
 {
-	u8 ret;
+	u8 ret = 0;
 
 	sii8620_read_buf(ctx, addr, &ret, 1);
 	return ret;