Fixed defects

List of Defects

Error: CLANG_WARNING: [#def1]
exfatprogs-1.2.2-build/exfatprogs-1.2.2/exfat2img/exfat2img.c:895:2: warning[core.uninitialized.UndefReturn]: Undefined or garbage value returned to caller
#  893|   	fsync(ei->out_fd);
#  894|   	exfat_free_buffer(ei->dump_bdesc, 2);
#  895|-> 	return ret;
#  896|   }
#  897|   

Error: CLANG_WARNING: [#def2]
exfatprogs-1.2.2-build/exfatprogs-1.2.2/fsck/fsck.c:1251:2: warning[deadcode.DeadStores]: Value stored to 'err' is never read
# 1249|   	if (err && err != EOF)
# 1250|   		exfat_err("failed to read volume label\n");
# 1251|-> 	err = 0;
# 1252|   
# 1253|   	err = read_bitmap(exfat);

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