Warning removal fix

Warning removal fix

Minor fix of data type corrections.

gcc -std=c99 -I. -I../include -I../common -I../zlib -I/opt/local/include -I../liblua -Wall  -g -O4 -DHAVE_GUI -DZ_SOLO -DZ_PREFIX -DNO_GZIP -DZLIB_PM3_TUNED  -c -o obj/fpga_compress.o fpga_compress.c
fpga_compress.c: I funktion "zlib_compress":
fpga_compress.c:90:20: varning: format "%lu" förväntar sig argument av typen "long unsigned int", men argument 3 har typen "int" [-Wformat=]
    fprintf(stderr, "Input files too big (total > %lu bytes). These are probably not PM3 FPGA config files.\n", num_infiles*FPGA_CONF
                    ^
fpga_compress.c:142:18: varning: format "%lu" förväntar sig argument av typen "long unsigned int", men argument 3 har typen "uint32_t {även unsigned int}" [-Wformat=]
  fprintf(stderr, "compressed %lu input bytes to %lu output bytes\n", i, compressed_fpga_stream.total_out);