fix: remove regression introduced by b269533.

When the maintainers of squashfs-tools introduced non-fatal error
hardening, they also introduced a regression for sasquatch.

This was introduced by commit b269533,
where "If the writer thread fails to write a block to the output
filesystem, treat this as a fatal error.".

The problem is that these non-fatal error will happen when sasquatch
enumerate through the different compression implementation, and
especially with LZMA adaptive it appears.

The fix is to explicitly ignore errors during the decompression
attempts.

squashfs-tools/compressor.c

@@ -78,6 +78,7 @@ extern struct compressor lzma_alt_comp_ops;
 extern struct compressor lzma_wrt_comp_ops;
 extern struct compressor lzma_adaptive_comp_ops;
 
+extern int ignore_errors;
 
 static struct compressor unknown_comp_ops = {
 	0, "unknown"
@@ -173,11 +174,16 @@ int compressor_uncompress(struct compressor *comp, void *dest, void *src, int si
 {
     int i = 0, retval = -1, default_compressor_id = -1;
 
+    int global_ignore_errors = ignore_errors;
+    ignore_errors = 1;
+
     if(detected_compressor_index)
     {
         retval = compressor[detected_compressor_index]->uncompress(dest, src, size, block_size, error);
     }
 
+    ignore_errors = global_ignore_errors;
+
     if(retval < 1 && comp->uncompress)
     {
         if(!detected_compressor_index) {