mem: do not check for negative size

size_t is guaranteed to be unsigned

Signed-off-by: Anton Khirnov <anton@khirnov.net>
fft-test: add a missing #include

stdio.h needed for printf since 7177df90a043bd59e172843fc7cb9e767080ea12
Merge commit 'b284e1ffe343d6697fb950d1ee517bafda8a9844'

* commit 'b284e1ffe343d6697fb950d1ee517bafda8a9844':
  mem: do not check for negative size

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  fft-test: add a missing #include

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avutil/utils: check that size_t is unsigned

ANSI/ISO C guarantee this, yet there is evidence that there exist
platforms where its not so.
See: http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/library_30.html

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/utils: do not override pts in h264 when they are provided from the demuxer

Fixes Ticket2143

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>