log: make WLOG macro a noop if logging disabled

even if logging is disabled, the strings are still
included in the binary. This is because the compiler
does not see that wolfSSH_Log() is compiled as a noop.

By making WLOG a noop if wolfSSH_Log is we reduce the
compiled so-file by ~50k (about 25%).

Author: AxlLind

src/internal.c

@@ -11281,6 +11281,7 @@ int wolfSSH_RsaVerify(const byte *sig, word32 sigSz,
         compare = ConstantCompare(encDigest, checkDigest, encDigestSz);
 
         if (checkDigestSz < 0 || sizeCompare || compare) {
+            (void)loc; // unused if log disabled
             WLOG(WS_LOG_DEBUG, "%s: %s", loc, "Bad RSA Verify");
             ret = WS_RSA_E;
         }

wolfssh/log.h

@@ -72,15 +72,17 @@ WOLFSSH_API int wolfSSH_LogEnabled(void);
 WOLFSSH_API void wolfSSH_Log(enum wolfSSH_LogLevel,
                              const char *const, ...) FMTCHECK;
 
+#if defined(DEBUG_WOLFSSH) || defined(WOLFSSH_SSHD)
 #define WLOG(...) do { \
                       if (wolfSSH_LogEnabled()) \
                           wolfSSH_Log(__VA_ARGS__); \
                   } while (0)
-
+#else
+#define WLOG(...)
+#endif
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* _WOLFSSH_LOG_H_ */
-