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libhttpd: use strtol to parse decimal character references in httpunesc()

--- a/sys/src/libhttpd/httpunesc.c

+++ b/sys/src/libhttpd/httpunesc.c

@@ -18,7 +18,7 @@

 	for(t = v; c = *s;){

 		if(c == '&'){

 			if(s[1] == '#' && s[2] && s[3] && s[4] && s[5] == ';'){

-				c = atoi(s+2);

+				c = strtol(s+2, 0, 10);

 				if(c < Runeself){

 					*t++ = c;

 					s += 6;