fix bad decompression size error

compress.c

@@ -274,7 +274,7 @@ size_t unpack_from_file (FILE *file, size_t offset, uint8_t *unpacked) {
 	
 	fseek(file, offset, SEEK_SET);
 	fread((void*)packed, DATA_SIZE, 1, file);
-	if (!feof(file))
+	if (!ferror(file))
 		return unpack(packed, unpacked);
 		
 	return 0;

exhal.c

@@ -52,7 +52,7 @@ int main (int argc, char **argv) {
 	} else {
 		fprintf(stderr, "Error: Unable to decompress %s because an invalid offset was specified\n"
 		                "       (must be between zero and 0x%X).\n", argv[1], ftell(infile));
-		outputsize = 0;
+		exit(-1);
 	}
 	
 	if (outputsize) {