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libsec/base58enc: null-terminate the result

--- a/sys/src/libsec/port/ecc.c

+++ b/sys/src/libsec/port/ecc.c

@@ -498,7 +498,7 @@

 	}

 	for(; *src == 0; src++)

 		*dst++ = code[0];

-	dst--;

+	*dst-- = 0;

 	while(dst > sdst){

 		t = *sdst;

 		*sdst++ = *dst;