[XRootD mover] Fix cgi truncation error.

Michal Kamil Simonrequested to merge
fix-xrootd-cgi-truncation into master

E.g. in statement like:

if ((qpos = info_str.find("tried") != STR_NPOS))

operator '!=' takes precedence over '=' hance in case "tried" is found 'qpos' is assigned with boolean true, which gets cast into int of value 1.

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