reset: remove remaining WARN_ON() in <linux/reset.h>

Commit bb475230 ("reset: make optional functions really optional")
gave a new meaning to _get_optional variants.

The differentiation by WARN_ON() is not needed any more.  We already
have inconsistency about this; (devm_)reset_control_get_exclusive()
has WARN_ON() check, but of_reset_control_get_exclusive() does not.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

include/linux/reset.h

@@ -125,9 +125,6 @@ static inline int device_reset_optional(struct device *dev)
 static inline struct reset_control *
 __must_check reset_control_get_exclusive(struct device *dev, const char *id)
 {
-#ifndef CONFIG_RESET_CONTROLLER
-	WARN_ON(1);
-#endif
 	return __reset_control_get(dev, id, 0, false, false);
 }
 
@@ -273,9 +270,6 @@ static inline struct reset_control *
 __must_check devm_reset_control_get_exclusive(struct device *dev,
 					      const char *id)
 {
-#ifndef CONFIG_RESET_CONTROLLER
-	WARN_ON(1);
-#endif
 	return __devm_reset_control_get(dev, id, 0, false, false);
 }