Fix FTBFS on Debian systems with kernel 6.8.0-rc8

Signed-off-by: Timothy Pearson <[email protected]>

Author: tpearson-ssc

include/dahdi/kernel.h

@@ -1562,11 +1562,13 @@ static inline void *PDE_DATA(const struct inode *inode)
 #endif
 #endif
 
-#if defined(RHEL_RELEASE_CODE) && LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0) && \
+#if defined(RHEL_RELEASE_CODE) && defined(RHEL_RELEASE_VERSION)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0) && \
               RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(9,1)
 #define netif_napi_add netif_napi_add_weight
 #define PDE_DATA(i)     pde_data(i)
 #endif
+#endif
 
 #ifndef TIMER_DATA_TYPE
 #define TIMER_DATA_TYPE struct timer_list *