[JFFS2] Add declaration of jffs2_lzo_{init,exit} to compr.h

fs/jffs2/compr.c: In function ‘jffs2_compressors_init’:
fs/jffs2/compr.c:320: warning: implicit declaration of function ‘jffs2_lzo_init’
fs/jffs2/compr.c: In function ‘jffs2_compressors_exit’:
fs/jffs2/compr.c:346: warning: implicit declaration of function ‘jffs2_lzo_exit’

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/compr.h

@@ -94,5 +94,9 @@ void jffs2_rtime_exit(void);
 int jffs2_zlib_init(void);
 void jffs2_zlib_exit(void);
 #endif
+#ifdef CONFIG_JFFS2_LZO
+int jffs2_lzo_init(void);
+void jffs2_lzo_exit(void);
+#endif
 
 #endif /* __JFFS2_COMPR_H__ */