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games/nes: workaround for truncated chr

--- a/sys/src/games/nes/nes.c

+++ b/sys/src/games/nes/nes.c

@@ -85,7 +85,7 @@

 		chr = malloc(nchr * CHRSZ);

 		if(chr == nil)

 			sysfatal("malloc: %r");

-		if(readn(fd, chr, nchr * CHRSZ) < nchr * CHRSZ)

+		if(readn(fd, chr, nchr * CHRSZ) < 1)

 			sysfatal("read: %r");

 	}else{

 		nchr = 1;