missing GF_FREE for args->errstr, which is generated by gf_strdup in gd_collate_errors/gd_mgmt_v3_collate_errors

[chen1195585098]

The memory allocated for args->errstr via gf_strdup must be explicitly freed before the function returns or at the appropriate cleanup point.

Meanwhile, I got the following error during compilation with the latest code:

    ec-inode-read.c: In function 'ec_manager_readv':
    ec-inode-read.c:1375:13: error: a label can only be part of a statement and a declaration is not a statement
                 uintptr_t inode_read_mask = ec_inode_readmask_get(fop->fd->inode,
                 ^~~~~~~~~
    make[5]: *** [Makefile:650: ec-inode-read.lo] Error 1

It occurs because inode_read_mask is declared in case-label.