Simplify jtag_execute_queue:

- Add static inline jtag_error_clear helper to return and clear jtag_error.
- Use new helper to shrink body of function to two lines.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2117 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/jtag.c

@@ -914,11 +914,8 @@ int jtag_get_flush_queue_count(void)
 
 int jtag_execute_queue(void)
 {
-	int retval;
 	jtag_execute_queue_noclear();
-	retval=jtag_error;
-	jtag_error=ERROR_OK;
-	return retval;
+	return jtag_error_clear();
 }
 
 static int jtag_reset_callback(enum jtag_event event, void *priv)

src/jtag/jtag.h

@@ -561,7 +561,16 @@ static __inline__ void jtag_set_error(int error)
 	jtag_error=error;
 }
 
-
+/**
+ * Resets jtag_error to ERROR_OK, returning its previous value.
+ * @returns The previous value of @c jtag_error.
+ */
+static inline int jtag_error_clear(void)
+{
+	int temp = jtag_error;
+	jtag_error = ERROR_OK;
+	return temp;
+}
 
 /* can be implemented by hw+sw */
 extern int jtag_power_dropout(int* dropout);