regulator: Fix typo in comment of struct regulator_linear_range

regulator_map_linar_range() => regulator_map_linear_range()
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/linux/regulator/driver.h

@@ -46,7 +46,7 @@ enum regulator_status {
 /**
  * struct regulator_linear_range - specify linear voltage ranges
  *
- * Specify a range of voltages for regulator_map_linar_range() and
+ * Specify a range of voltages for regulator_map_linear_range() and
  * regulator_list_linear_range().
  *
  * @min_uV:  Lowest voltage in range