device.h: fix inconsistent semicolon logic for DEVICE_DT_DEFINE

When CONFIG_LLEXT_EXPORT_DEVICES is not enabled, the DEVICE_DT_DEFINE
macro ends with the contents of the Z_DEVICE_DEFINE macro, which always
includes a terminating semicolon.

When CONFIG_LLEXT_EXPORT_DEVICES is enabled, the macro ends with
Z_DEVICE_EXPORT, which does _not_ include a terminating semicolon. This
leads to a syntax error in places where the DEVICE_DT_DEFINE macro is
used without it.

Fix this by adjusting the added code when CONFIG_LLEXT_EXPORT_DEVICES is
enabled to include a semicolon after the Z_DEVICE_EXPORT macro; also use
the opportunity to remove a stray backslash.

Signed-off-by: Luca Burelli <[email protected]>

include/zephyr/device.h

@@ -208,7 +208,7 @@ typedef int16_t device_handle_t;
 			level, prio, api,                                      \
 			&Z_DEVICE_STATE_NAME(Z_DEVICE_DT_DEV_ID(node_id)),     \
 			__VA_ARGS__)                                           \
-	IF_ENABLED(CONFIG_LLEXT_EXPORT_DEVICES, (; Z_DEVICE_EXPORT(node_id)))  \
+	IF_ENABLED(CONFIG_LLEXT_EXPORT_DEVICES, (Z_DEVICE_EXPORT(node_id);))
 
 /**
  * @brief Like DEVICE_DT_DEFINE(), but uses an instance of a `DT_DRV_COMPAT`