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cc: getflag() fmt will be terminated at end of loop (from charles forsyth)

--- a/sys/src/cmd/cc/dpchk.c

+++ b/sys/src/cmd/cc/dpchk.c

@@ -76,9 +76,9 @@

 	nstar = 0;

 	while(fmt < e){

 		s += chartorune(&c, s);

-		fmt += runetochar(fmt, &c);

 		if(c == 0 || c >= nelem(flagbits))

 			break;

+		fmt += runetochar(fmt, &c);

 		f = flagbits[c];

 		switch(f) {

 		case Fnone: