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fix findrepo when repository is at /.git

--- a/util.c

+++ b/util.c

@@ -299,7 +299,7 @@

 	for(p = buf + strlen(buf); p != nil; p = strrchr(buf, '/')){

 		strcpy(p, suff);

 		if(access(buf, AEXIST) == 0){

-			*p = 0;

+			p[p == buf] = '\0';

 			return 0;

 		}

 		*p = '\0';