Fixed CJMCU build fail

src/main/sensors/initialisation.c

@@ -88,11 +88,10 @@ const extiConfig_t *selectMPUIntExtiConfig(void)
 #if defined(MPU_INT_EXTI)
     static const extiConfig_t mpuIntExtiConfig = { .io = IO_TAG(MPU_INT_EXTI) };
     return &mpuIntExtiConfig;
-#endif
+#elif defined(USE_HARDWARE_REVISION_DETECTION) 
-    
-#ifdef USE_HARDWARE_REVISION_DETECTION
     return selectMPUIntExtiConfigByHardwareRevision();
-#else
    return NULL;
+#else
+    return NULL;
 #endif    
 }
 

src/main/target/CJMCU/hardware_revision.c

@@ -28,6 +28,7 @@
 #include "drivers/sensor.h"
 #include "drivers/accgyro.h"
 #include "drivers/accgyro_spi_mpu6500.h"
+#include "drivers/exti.h"
 
 #include "hardware_revision.h"
 
@@ -51,3 +52,8 @@ void detectHardwareRevision(void)
 void updateHardwareRevision(void)
 {
 }
+
+const extiConfig_t *selectMPUIntExtiConfigByHardwareRevision(void)
+{
+	return NULL;
+}

src/main/target/CJMCU/hardware_revision.h

@@ -14,6 +14,9 @@
  * You should have received a copy of the GNU General Public License
  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
+
+ #include "drivers/exti.h"
  
 typedef enum cjmcuHardwareRevision_t {
     UNKNOWN = 0,
@@ -27,3 +30,5 @@ void updateHardwareRevision(void);
 void detectHardwareRevision(void);
 
 void spiBusInit(void);
+
+const extiConfig_t *selectMPUIntExtiConfigByHardwareRevision(void);