[logging] Default to stdout if MONO_LOG_DEST is unset (#3272)

Follow up to e70a8aca1cd575582459db406ab3410e53074b73, do what the man
page says and default to stdout if MONO_LOG_DEST isn't specified.

diff --git a/mono/utils/mono-logger.c b/mono/utils/mono-logger.c
index 38c485212be072884592828e2d5597ac4279838f..8c6c5aa5512662c6825742cdea87985d042f3d00 100644 (file)
--- a/mono/utils/mono-logger.c
+++ b/mono/utils/mono-logger.c
@@ -148,7 +148,7 @@ mono_trace_set_logdest_string (const char *dest)
        if(level_stack == NULL)
                mono_trace_init();
 
-       if ((dest != NULL) && (strcmp("syslog", dest) != 0)) {
+       if ((dest == NULL) || (strcmp("syslog", dest) != 0)) {
                logger.opener = mono_log_open_logfile;
                logger.writer = mono_log_write_logfile;
                logger.closer = mono_log_close_logfile;