On Linux, one sometimes sees spurious errors after interrupting

previous output.  Call clearerr() to prevent past errors affecting our
ferror() test later, in PyObject_Print().  Suggested by Marc Lemburg.

Objects/object.c

@@ -168,6 +168,7 @@ PyObject_Print(op, fp, flags)
 		return -1;
 	}
 #endif
+	clearerr(fp); /* Clear any previous error condition */
 	if (op == NULL) {
 		fprintf(fp, "<nil>");
 	}