Fix for SIGSEGV when bad payload comes in

[racerxdl]

For some reason the attached payload crashes the library with a SIGSEGV. The fix solves the issue by just returning error.

Test code:

#include <szlib.h>
#include <stdio.h>

int main() {
  int inputLength = 731;
  char output[5424];
  char input[731];

  SZ_com_t params;

  FILE *f = fopen("input.bin", "rb");
  fread(input, inputLength, 1, f);
  fclose(f);

  //  {options_mask = 177, bits_per_pixel = 8, pixels_per_block = 32, pixels_per_scanline = 5424}
  params.options_mask = 177;
  params.bits_per_pixel = 8;
  params.pixels_per_block = 32;
  params.pixels_per_scanline = 5424;

  size_t destLen = 5424;
  int status = SZ_BufftoBuffDecompress(output, &destLen, input, inputLength, &params);
  f = fopen("raw.dec", "wb");
  fwrite(output, destLen, 1, f);
  fclose(f);

  return status != AEC_OK ? status : destLen;
}

input.zip