doc: aliasing-test: close fd on write error

If write fails, remember to close(fd) before returning.
Signed-off-by: NJesper Juhl <jj@chaosbits.net>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/ia64/aliasing-test.c

@@ -132,6 +132,7 @@ static int read_rom(char *path)
 
 	rc = write(fd, "1", 2);
 	if (rc <= 0) {
+		close(fd);
 		perror("write");
 		return -1;
 	}