Revert "make fluid_log() thread safe"

This reverts commit d25cdae.
Mistakenly committed too early on the wrong branch.

src/utils/fluid_sys.c

@@ -169,20 +169,20 @@ fluid_default_log_function(int level, const char *message, void *data)
 int
 fluid_log(int level, const char *fmt, ...)
 {
+    fluid_log_function_t fun = NULL;
+
+    va_list args;
+    va_start(args, fmt);
+    FLUID_VSNPRINTF(fluid_errbuf, sizeof(fluid_errbuf), fmt, args);
+    va_end(args);
+
     if((level >= 0) && (level < LAST_LOG_LEVEL))
     {
-        fluid_log_function_t fun = fluid_log_function[level];
+        fun = fluid_log_function[level];
 
         if(fun != NULL)
         {
-            char errbuf[1024];
-
-            va_list args;
-            va_start(args, fmt);
-            FLUID_VSNPRINTF(errbuf, sizeof(errbuf), fmt, args);
-            va_end(args);
-
-            (*fun)(level, errbuf, fluid_log_user_data[level]);
+            (*fun)(level, fluid_errbuf, fluid_log_user_data[level]);
         }
     }