hwmon: (oxp-sensors) Add missing breaks to fix -Wimplicit-fallthrough with clang

clang warns (or errors due to CONFIG_WERROR):

  drivers/hwmon/oxp-sensors.c:481:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:553:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:556:2: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  drivers/hwmon/oxp-sensors.c:607:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]

Clang is a little more pedantic than GCC, which does not warn when
falling through to a case that is just break or return. Clang's version
is more in line with the kernel's own stance in deprecated.rst, which
states that all switch/case blocks must end in either break,
fallthrough, continue, goto, or return. Add the missing breaks to
silence the warnings.

Fixes: b82b38a4 ("hwmon: (oxp-sensors) Add support for multiple new devices.")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Message-ID: <20240828-hwmon-oxp-sensors-fix-clang-implicit-fallthrough-v1-1-dc48496ac67a@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/oxp-sensors.c

@@ -478,6 +478,7 @@ static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
 			default:
 				break;
 			}
+			break;
 		default:
 			break;
 		}
@@ -550,9 +551,11 @@ static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
 			default:
 				break;
 			}
+			break;
 		default:
 			break;
 		}
+		break;
 	default:
 		break;
 	}
@@ -604,6 +607,7 @@ static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type,
 			default:
 				break;
 			}
+			break;
 		default:
 			break;
 		}