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cpu: properly handle end of file in readstr()

--- a/sys/src/cmd/cpu.c

+++ b/sys/src/cmd/cpu.c

@@ -430,6 +430,10 @@

 		n = read(fd, str, 1);

 		if(n < 0) 

 			return -1;

+		if(n == 0){

+			werrstr("hung up");

+			return -1;

+		}

 		if(*str == '\0')

 			return 0;

 		str++;