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9gc: ctxread: print the error

--- a/9pex.c

+++ b/9pex.c

@@ -562,10 +562,12 @@

 		if ((r = read(in, rdbuf+n, size-n)) <= 0) {

 			if (r == EINTR)

 				continue;

-			if (r == 0)

+			if (r == 0) {

 				eof = 1;

-			else

+			} else {

 				*err = 1;

+				perror("ctxread");

+			}

 			return NULL;

 		}

 	}