dib7000m: Remove unnecessary null test

This patch removes the null test on ch. ch is initialized at the beginning of the function to &demod->dtv_property_cache. Since demod is dereferenced prior to the null test, demod must be a valid pointer, and &demod->dtv_property_cache cannot be null.

The following Coccinelle script is used for detecting the change:

@r@
expression e,f;
identifier g,y;
statement S1,S2;
@@

*e = &f->g
<+...
f->y
...+>
*if (e != NULL || ...)
S1 else S2

---
 drivers/media/dvb-frontends/dib7000m.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

index 148bf79..dcb9a15 100644
@@ -1041,10 +1041,7 @@ static int dib7000m_tune(struct dvb_frontend *demod)
 	u16 value;
 
 	// we are already tuned - just resuming from suspend
-	if (ch != NULL)
-		dib7000m_set_channel(state, ch, 0);
-	else
-		return -EINVAL;
+	dib7000m_set_channel(state, ch, 0);
 
 	// restart demod
 	ret |= dib7000m_write_word(state, 898, 0x4000);

1.9.1