modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/arch/mips/fw/lib/cmdline.c
..
..
@@ -53,7 +53,7 @@
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 {
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 	char *result = NULL;
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-	if (_fw_envp != NULL) {
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+	if (_fw_envp != NULL && fw_envp(0) != NULL) {
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 		/*
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 		 * Return a pointer to the given environment variable.
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 		 * YAMON uses "name", "value" pairs, while U-Boot uses