CLKDEV: Fix clkdev return value for NULL clk case

clkdev may incorrectly cause a clkdev entry with a NULL clk to return
-ENOENT.  This is not the intention of this code; -ENOENT should only
be returned if the clock entry can not be found in the table.  Fix
this.
Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/clk/clkdev.c

@@ -32,10 +32,9 @@ static DEFINE_MUTEX(clocks_mutex);
  * Then we take the most specific entry - with the following
  * order of precedence: dev+con > dev only > con only.
  */
-static struct clk *clk_find(const char *dev_id, const char *con_id)
+static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
 {
-	struct clk_lookup *p;
-	struct clk *clk = NULL;
+	struct clk_lookup *p, *cl = NULL;
 	int match, best = 0;
 
 	list_for_each_entry(p, &clocks, node) {
@@ -52,27 +51,27 @@ static struct clk *clk_find(const char *dev_id, const char *con_id)
 		}
 
 		if (match > best) {
-			clk = p->clk;
+			cl = p;
 			if (match != 3)
 				best = match;
 			else
 				break;
 		}
 	}
-	return clk;
+	return cl;
 }
 
 struct clk *clk_get_sys(const char *dev_id, const char *con_id)
 {
-	struct clk *clk;
+	struct clk_lookup *cl;
 
 	mutex_lock(&clocks_mutex);
-	clk = clk_find(dev_id, con_id);
-	if (clk && !__clk_get(clk))
-		clk = NULL;
+	cl = clk_find(dev_id, con_id);
+	if (cl && !__clk_get(cl->clk))
+		cl = NULL;
 	mutex_unlock(&clocks_mutex);
 
-	return clk ? clk : ERR_PTR(-ENOENT);
+	return cl ? cl->clk : ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL(clk_get_sys);