avcodec/tiff: move bpp check to after "end:"

This ensures that all current and future code-pathes get bpp checked

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit d5e9fc782150d4596c72440a0aa02b7f4f1254b1)

Conflicts:

	libavcodec/tiff.c
1 file changed