add missing const keyword to log_filter's members

lib/include/srslte/common/log.h

@@ -129,13 +129,13 @@ public:
   virtual void debug(const char * message, ...)   __attribute__ ((format (printf, 2, 3))) = 0;
 
   // Same with hex dump
-  virtual void error_hex(uint8_t *hex, int size, const char *, ...)   __attribute__((format (printf, 4, 5)))
+  virtual void error_hex(const uint8_t *hex, int size, const char *, ...)   __attribute__((format (printf, 4, 5)))
     {error("error_hex not implemented.\n");}
-  virtual void warning_hex(uint8_t *hex, int size, const char *, ...) __attribute__((format (printf, 4, 5)))
+  virtual void warning_hex(const uint8_t *hex, int size, const char *, ...) __attribute__((format (printf, 4, 5)))
     {error("warning_hex not implemented.\n");}
-  virtual void info_hex(uint8_t *hex, int size, const char *, ...)    __attribute__((format (printf, 4, 5)))
+  virtual void info_hex(const uint8_t *hex, int size, const char *, ...)    __attribute__((format (printf, 4, 5)))
     {error("info_hex not implemented.\n");}
-  virtual void debug_hex(uint8_t *hex, int size, const char *, ...)   __attribute__((format (printf, 4, 5)))
+  virtual void debug_hex(const uint8_t *hex, int size, const char *, ...)   __attribute__((format (printf, 4, 5)))
     {error("debug_hex not implemented.\n");}
 
 protected:

lib/include/srslte/common/log_filter.h

@@ -57,16 +57,16 @@ public:
 
   void init(std::string layer, logger *logger_, bool tti=false);
 
-  void console(const char * message, ...);
-  void error(const char * message, ...);
-  void warning(const char * message, ...);
-  void info(const char * message, ...);
-  void debug(const char * message, ...);
-
-  void error_hex(const uint8_t *hex, int size, const char * message, ...);
-  void warning_hex(const uint8_t *hex, int size, const char * message, ...);
-  void info_hex(const uint8_t *hex, int size, const char * message, ...);
-  void debug_hex(const uint8_t *hex, int size, const char * message, ...);
+  void console(const char * message, ...) __attribute__ ((format (printf, 2, 3)));
+  void error(const char * message, ...)   __attribute__ ((format (printf, 2, 3)));
+  void warning(const char * message, ...) __attribute__ ((format (printf, 2, 3)));
+  void info(const char * message, ...)    __attribute__ ((format (printf, 2, 3)));
+  void debug(const char * message, ...)   __attribute__ ((format (printf, 2, 3)));
+
+  void error_hex(const uint8_t *hex, int size, const char * message, ...)   __attribute__((format (printf, 4, 5)));
+  void warning_hex(const uint8_t *hex, int size, const char * message, ...) __attribute__((format (printf, 4, 5)));
+  void info_hex(const uint8_t *hex, int size, const char * message, ...)    __attribute__((format (printf, 4, 5)));
+  void debug_hex(const uint8_t *hex, int size, const char * message, ...)   __attribute__((format (printf, 4, 5)));
 
   class time_itf {
   public: