* modules/dav/main/util.c (dav_validate_resource_state): Fix error #637

Job	Run time
Empty APLOGNO() test	27s
Default	3m 20s
All-static modules	3m 33s
Prefork MPM, all-modules (except cgid)	4m 1s
Worker MPM, all-modules	3m 57s
Shared MPMs, all-modules	4m 19s
Event MPM, all-modules, mod_cgid only	3m 55s
Event MPM, all-modules, no CMSG_DATA	4m 38s
Default, all-modules + install	4m 42s
Default, all-modules, random test order	4m 1s
GCC 10 maintainer-mode w/-Werror, install + VPATH	3m 32s
All-modules, APR 1.7.4, APR-util 1.6.3	5m 31s
APR 1.8.x, APR-util 1.7.x	5m 29s
Pool-debug	6m 11s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 30s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 32s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 57s
litmus WebDAV tests	2m 7s
litmus WebDAV tests, APR trunk, LMDB	2m 33s
Regenerate ap_expr	3m 48s
APR 1.7.4, APR-util 1.6.3, LDAP	5m 20s
APR trunk thread debugging	4m 41s
UBSan	4m 33s
ASan	6m 19s
ASan, pool-debug	7m 20s
HTTP/2 test suite	12m 7s
MOD_TLS test suite	5m 12s
	2h 20m 35s

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