sensor: icm4568x: Address existing code issues by static analysis

Put in a separate commit in order to make it easier to keep track of
changes.

Signed-off-by: Luis Ubieda <luisf@croxel.com>

Author: ubieda

drivers/sensor/tdk/icm4268x/icm4268x.h

@@ -200,6 +200,9 @@ static inline void icm4268x_accel_reg_to_hz(uint8_t odr, struct sensor_value *ou
 		out->val1 = 1;
 		out->val2 = 562500;
 		return;
+	default:
+		CODE_UNREACHABLE;
+		return;
 	}
 }
 
@@ -283,6 +286,8 @@ static inline void icm4268x_gyro_reg_to_odr(uint8_t odr, struct sensor_value *ou
 		out->val1 = 12;
 		out->val2 = 500000;
 		return;
+	default:
+		CODE_UNREACHABLE;
 	}
 }
 

drivers/sensor/tdk/icm4268x/icm4268x_decoder.c

@@ -116,7 +116,7 @@ int icm4268x_convert_raw_to_q31(struct icm4268x_cfg *cfg, enum sensor_channel ch
 	if (shift < 0) {
 		intermediate =
 			intermediate * ((int64_t)INT32_MAX + 1) * (1 << -shift) / INT64_C(1000000);
-	} else if (shift > 0) {
+	} else if (shift >= 0) {
 		intermediate =
 			intermediate * ((int64_t)INT32_MAX + 1) / ((1 << shift) * INT64_C(1000000));
 	}
@@ -513,6 +513,8 @@ static int icm4268x_fifo_decode(const uint8_t *buffer, struct sensor_chan_spec c
 				buffer = frame_end;
 				continue;
 			}
+		} else {
+			CODE_UNREACHABLE;
 		}
 		buffer = frame_end;
 		*fit = (uintptr_t)frame_end;

drivers/sensor/tdk/icm4268x/icm4268x_emul.c

@@ -58,6 +58,8 @@ static void icm4268x_emul_handle_write(const struct emul *target, uint8_t regn,
 			data->reg[REG_INT_STATUS] |= BIT_RESET_DONE_INT;
 		}
 		break;
+	default:
+		__ASSERT_UNREACHABLE;
 	}
 }