Prevent unreachable statements and correct variable sizes.

Author: hugueskamba

drivers/USBAudio.h

@@ -373,8 +373,8 @@ class USBAudio: protected USBDevice {
     usb_ep_t _episo_in;     // tx endpoint
 
     // channel config in the configuration descriptor: master, left, right
-    uint8_t _channel_config_rx;
-    uint8_t _channel_config_tx;
+    uint16_t _channel_config_rx;
+    uint16_t _channel_config_tx;
 
     // configuration descriptor
     uint8_t _config_descriptor[183];

rtos/source/Semaphore.cpp

@@ -212,8 +212,9 @@ osStatus Semaphore::release(void)
             return osErrorResource;
         }
     } while (!core_util_atomic_cas_s32(&_count, &old_count, old_count + 1));
-#endif
+
     return osOK;
+#endif // MBED_CONF_RTOS_PRESENT
 }
 
 Semaphore::~Semaphore()

rtos/source/TARGET_CORTEX/mbed_rtos_rtx.c

@@ -114,6 +114,9 @@ MBED_NORETURN void mbed_rtos_start()
     }
 
     osKernelStart();
+#if MBED_TRAP_ERRORS_ENABLED
     MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_INITIALIZATION_FAILED), "Failed to start RTOS");
+#else
     while (1); // Code should never get here
+#endif // MBED_TRAP_ERRORS_ENABLED
 }

rtos/source/TARGET_CORTEX/mbed_rtx_handlers.c

@@ -53,6 +53,7 @@ __NO_RETURN void osRtxIdleThread(void *argument)
 
 __NO_RETURN uint32_t osRtxErrorNotify(uint32_t code, void *object_id)
 {
+#if MBED_TRAP_ERRORS_ENABLED
     switch (code) {
         case osRtxErrorStackUnderflow:
             // Stack underflow detected for thread (thread_id=object_id)
@@ -80,9 +81,10 @@ __NO_RETURN uint32_t osRtxErrorNotify(uint32_t code, void *object_id)
             MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_KERNEL, MBED_ERROR_CODE_UNKNOWN), "CMSIS-RTOS error: Unknown", code);
             break;
     }
-
+#else
     /* That shouldn't be reached */
     for (;;) {}
+#endif // MBED_TRAP_ERRORS_ENABLED
 }
 
 #if defined(MBED_TRAP_ERRORS_ENABLED) && MBED_TRAP_ERRORS_ENABLED