* grub-core/commands/cmp.c (grub_cmd_cmp): Remove unnecessary NULL

	* grub-core/commands/cmp.c (grub_cmd_cmp): Remove unnecessary NULL
	pointer checks before calling grub_free().
	* grub-core/commands/wildcard.c (match_devices): Likewise.
	* grub-core/commands/wildcard.c (match_files): Likewise.
	* grub-core/fs/cpio.c (grub_cpio_dir): Likewise.
	* grub-core/fs/cpio.c (grub_cpio_open): Likewise.
	* grub-core/fs/udf.c (grub_udf_read_block): Likewise.
	* grub-core/fs/xfs.c (grub_xfs_read_block): Likewise.
	* grub-core/loader/efi/chainloader.c (grub_cmd_chainloader): Likewise.
	* grub-core/normal/cmdline.c (grub_cmdline_get): Likewise.
	* grub-core/script/yylex.l (grub_lexer_unput): Likewise.
	* grub-core/video/readers/jpeg.c (grub_video_reader_jpeg): Likewise.
	* grub-core/video/readers/png.c (grub_png_output_byte): Likewise.