trace: Remove space next to the class attribute of the trace.

src/gallium/drivers/trace/tr_dump.c

@@ -351,7 +351,7 @@ void trace_dump_call_begin_locked(const char *klass, const char *method)
    trace_dump_indent(1);
    trace_dump_writes("<call no=\'");
    trace_dump_writef("%lu", call_no);
-   trace_dump_writes("\' class =\'");
+   trace_dump_writes("\' class=\'");
    trace_dump_escape(klass);
    trace_dump_writes("\' method=\'");
    trace_dump_escape(method);