Incorrect set end of decoded sample

[katyo]

Currently the end of data is set in a number of bytes:

FluidLite/src/fluid_defsfont.c

Line 561 in 7b5f279

sample->end = sampledata_size - 1;

But actually a number of samples (frames) should be set.

[katyo]

Because my PR was merged, can we close this issue?