BUG/MINOR: cfgparse-global: add missing gotos to error label in max-spread-checks

BUG/MINOR: cfgparse-global: add missing gotos to error label in max-spread-checks

The three error paths of the parse_time_err() call in the
"max-spread-checks" keyword only set the error code without leaving the
block, so that global.max_spread_checks was assigned an uninitialized
value right after the error was reported. No impact but clearly what
could report a build warning or a report from a static analyser. Let's
just add the missing gotos like everywhere else.

This may be backported to all supported versions.