apple/glx/log: added missing va_end() after va_copy()

Each invocation of va_copy() must be matched by a
corresponding invocation of va_end()

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Fixes: 51691f0767 "darwin: Use ASL for logging"
Signed-off-by: Andrii Simiklit <andrii.simiklit@globallogic.com>

src/glx/apple/apple_glx_log.c

@@ -97,6 +97,7 @@ void _apple_glx_vlog(int level, const char *file, const char *function,
         fprintf(stderr, "%-9s %24s:%-4d %s(%"PRIu64"): ",
                 _asl_level_string(level), file, line, function, thread);
         vfprintf(stderr, fmt, args2);
+        va_end(args2);
     }
 
     msg = asl_new(ASL_TYPE_MSG);