staging: sm750fb: Remove unused return variable in program_mode_registers()

staging: sm750fb: Remove unused return variable in program_mode_registers()

Drops variable ret as it is unused in the code. This therefore modifies
the return type of program_mode_registers() to void from int since the
return value is being ignored in all function calls. This improves code
readability and maintainability.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dorcas AnonoLitunya <anonolitunya@gmail.com>
Link: https://lore.kernel.org/r/20231019101348.22076-3-anonolitunya@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>