dahdi: Fix previous CentOS 6.5 commit.

The previous commit from earlier today to fix the backport of PDE_DATA was
wrong in that it would not then process the other defines for older kernels if
it detected it was running on a redhat release.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
(cherry picked from commit 71c003ba49)

include/dahdi/kernel.h

@@ -1402,6 +1402,8 @@ static inline short dahdi_txtone_nextsample(struct dahdi_chan *ss)
 #define DAHDI_FORMAT_AUDIO_MASK	((1 << 16) - 1)
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
+#ifdef RHEL_RELEASE_VERSION
+#if RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(6, 5)
 #ifdef CONFIG_PROC_FS
 #include <linux/proc_fs.h>
 static inline void *PDE_DATA(const struct inode *inode)
@@ -1409,6 +1411,16 @@ static inline void *PDE_DATA(const struct inode *inode)
 	return PDE(inode)->data;
 }
 #endif
+#endif
+#else
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+static inline void *PDE_DATA(const struct inode *inode)
+{
+	return PDE(inode)->data;
+}
+#endif
+#endif
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31)
 #define KERN_CONT ""
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)