qcacmn: Return success when debugfs is disabled

Currently, the QDF debugfs feature returns a no-support error code for
the init call when the feature is compiled out. Instead, return success
to avoid wlan load failure on some configurations and to make error
checking by the caller more straight forward under all configurations.

The deinit call also has the same problem, but none of the callers pay
attention to the return status. Additionally, the deinit function
returns success unconditionally when the feature is compiled in.
Rather than changing the return status to success when the feature is
compiled out, change the return type of the deinit function to void.

Change-Id: Iac3a47505142e149f70c67c5ba6cf0b2428d9488
CRs-Fixed: 2336872

qdf/inc/qdf_debugfs.h

@@ -70,9 +70,9 @@ QDF_STATUS qdf_debugfs_init(void);
 /**
  * qdf_debugfs_exit() - cleanup debugfs
  *
- * Return: QDF_STATUS
+ * Return: None
  */
-QDF_STATUS qdf_debugfs_exit(void);
+void qdf_debugfs_exit(void);
 
 /**
  * qdf_debugfs_create_dir() - create a debugfs directory
@@ -244,13 +244,10 @@ void qdf_debugfs_remove_file(qdf_dentry_t d);
 
 static inline QDF_STATUS qdf_debugfs_init(void)
 {
-	return QDF_STATUS_E_NOSUPPORT;
+	return QDF_STATUS_SUCCESS;
 }
 
-static inline QDF_STATUS qdf_debugfs_exit(void)
-{
-	return QDF_STATUS_E_NOSUPPORT;
-}
+static inline void qdf_debugfs_exit(void) { }
 
 static inline qdf_dentry_t qdf_debugfs_create_dir(const char *name,
 						  qdf_dentry_t parent)