* video/readers/jpeg.c (cmd): Declare.
(grub_cmd_jpegtest): Use `grub_command_t' type.
(GRUB_MOD_INIT): Fix arguments passed to `grub_register_command'.
Assign to `cmd'.
(GRUB_MOD_FINI): Use `cmd' to unregister.
* video/readers/png.c (cmd): Declare.
(grub_cmd_pngtest): Use `grub_command_t' type.
(GRUB_MOD_INIT): Fix arguments passed to `grub_register_command'.
Assign to `cmd'.
(GRUB_MOD_FINI): Use `cmd' to unregister.
* video/readers/tga.c (cmd): Declare.
(grub_cmd_tgatest): Use `grub_command_t' type.
(GRUB_MOD_INIT): Fix arguments passed to `grub_register_command'.
Assign to `cmd'.
(GRUB_MOD_FINI): Use `cmd' to unregister.
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