freedreno: fix dereference before null check

ptr can actually never be null so just drop the check.

CID 1362464 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking ptr suggests that it may be null,
but it has already been dereferenced on all paths leading to the check.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/drivers/freedreno/freedreno_query_hw.h

@@ -163,8 +163,7 @@ fd_hw_sample_reference(struct fd_context *ctx,
 
 	if (pipe_reference(&(*ptr)->reference, &samp->reference))
 		__fd_hw_sample_destroy(ctx, old_samp);
-	if (ptr)
-		*ptr = samp;
+	*ptr = samp;
 }
 
 #endif /* FREEDRENO_QUERY_HW_H_ */