util/log: Pass Error pointer to qemu_set_log

Do not force exit within qemu_set_log; return bool and pass
an Error value back up the stack as per usual.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220417183019.755276-5-richard.henderson@linaro.org>

bsd-user/main.c

@@ -414,7 +414,7 @@ int main(int argc, char **argv)
             qemu_print_log_usage(stdout);
             exit(1);
         }
-        qemu_set_log(mask);
+        qemu_set_log(mask, &error_fatal);
     }
 
     if (optind >= argc) {