Fix spelling: "occured" should be "occurred"
* checks/armor.test, cipher/des.c, g10/ccid-driver.c, g10/pkclist.c, util/regcomp.c, util/regex_internal.c: correct the spelling of "occured" to "occurred"
- Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>