auxdisplay: arm-charlcd: fix release_mem_region() size

auxdisplay: arm-charlcd: fix release_mem_region() size

It seems like, after the request_mem_region(), the corresponding
release_mem_region() must take the same size. This was done
in (now removed due to previous refactoring) charlcd_remove()
but not in the error path in charlcd_probe().

Fixes: ce8962455e90 ("ARM: 6214/2: driver for the character LCD found in ARM refdesigns")
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>