regulator: core: Fix typo in of_regulator.h

Fix a typo from my patch adding of_regulator_put_match in the patch:

regulator: core: Add helper to put of_nodes from matches

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/linux/regulator/of_regulator.h

@@ -38,7 +38,7 @@ static inline int of_regulator_match(struct device *dev,
 	return 0;
 }
 static inline int of_regulator_put_match(struct of_regulator_match *matches,
-					 unsigned int num_matches);
+					 unsigned int num_matches)
 {
 	return 0;
 }