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hgfs: fix sign bug in path mangeling

--- a/sys/src/cmd/hgfs/tree.c

+++ b/sys/src/cmd/hgfs/tree.c

@@ -26,7 +26,7 @@

 	for(i=0; i<nelem(frogs); i++){

 		l = strlen(frogs[i]);

 		if((strncmp(frogs[i], p, l) == 0) && (p[l] == 0 || p[l] == '.'))

-			return seprint(s, e, "%.2s~%.2x%s", p, p[2], p+3);

+			return seprint(s, e, "%.2s~%.2x%s", p, (uchar)p[2], p+3);

 	}

 	for(; s+4 < e && *p; p++){

 		if(*p == '_'){

@@ -35,9 +35,9 @@

 		} else if(*p >= 'A' && *p <= 'Z'){

 			*s++ = '_';

 			*s++ = 'a' + (*p - 'A');

-		} else if(*p >= 126 || strchr("\\:*?\"<>|", *p)){

+		} else if((uchar)*p >= 126 || strchr("\\:*?\"<>|", *p)){

 			*s++ = '~';

-			s = seprint(s, e, "%.2x", *p);

+			s = seprint(s, e, "%.2x", (uchar)*p);

 		} else

 			*s++ = *p;

 	}

-- 

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