Ensured that ecl_file_len() doesn't return a random value on error.

This partially addresses CID 66411 (Unchecked return value from library).
The call to fstat() should still probably have error checking added.

src/c/unixfsys.d

@@ -454,6 +454,7 @@ cl_object
 ecl_file_len(int f)
 {
 	struct stat filestatus;
+	memset(&filestatus, 0, sizeof(filestatus));
 	ecl_disable_interrupts();
 	fstat(f, &filestatus);
 	ecl_enable_interrupts();