[MDEV-28170] missing '$' in variable check in wsrep_sst_common script - Jira

~~MDEV-27181~~ introduced a problem in the wsrep_sst_common script which is only hit when using encrypted SST:

/usr//bin/wsrep_sst_common: line 1127: [: readable: integer expression expected

Problem is the readable variable in the if condition, it should be $readable like it is earlier on line 1109 in the same script:

1123     local readable=1; [ ! -r "$cert" ] && readable=0

1124     [ -n "$ca"  ] &&  [ ! -r "$ca"   ] && readable=0

1125     [ -n "$cap" ] &&  [ ! -r "$cap"  ] && readable=0

1127     if [ readable -eq 0 ]; then

1128         wsrep_log_error \

1129             "Both PEM file and CA file (or path) must be readable"

1130         exit 22

1131     fi

is caused by

MDEV-27181 Galera SST scripts should use ssl_capath (not ssl_ca) for CA directory

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