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acid: handle buffer overflow with ridiculous long symbol names (thanks mischief)

go seems to accidently creates ridiculous long symbol names
causing acid to crash.

--- a/sys/src/cmd/acid/util.c

+++ b/sys/src/cmd/acid/util.c

@@ -71,6 +71,12 @@

 			if(s->name[0] == '.')

 				continue;

+			if(strlen(s->name) >= sizeof(buf)-6){

+				if(!quiet)

+					print("Symbol name too long: %s\n", s->name);

+				continue;

+			}

+

 			v = s->value;

 			tl = al(TLIST);

 			*tail = tl;

-- 

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