Invalid format flags for size_t

[kamstrup]

Compilation fails for me with:

make[2]: Entering directory `/root/chef/ideviceinstaller/853cd7d45a4c7e33a7405af311725245/src'
  CC     ideviceinstaller-ideviceinstaller.o
ideviceinstaller.c: In function ‘main’:
ideviceinstaller.c:946:5: error: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘size_t’ [-Werror=format]
cc1: all warnings being treated as errors
make[2]: *** [ideviceinstaller-ideviceinstaller.o] Error 1
make[2]: Leaving directory `/root/chef/ideviceinstaller/853cd7d45a4c7e33a7405af311725245/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/chef/ideviceinstaller/853cd7d45a4c7e33a7405af311725245'
make: *** [all] Error 2