fs/ntfs3: Avoid UBSAN error on true_sectors_per_clst()

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: Avoid UBSAN error on true_sectors_per_clst()

syzbot reported UBSAN error as below:

[ 76.901829][ T6677] ================================================================================

[ 76.903908][ T6677] UBSAN: shift-out-of-bounds in fs/ntfs3/super.c:675:13

[ 76.905363][ T6677] shift exponent -247 is negative

This patch avoid this error.