Task #1554 - added.err

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Error: GCC_ANALYZER_WARNING (CWE-465):
systemd-stable-255.4/src/basic/unit-name.c: scope_hint: In function ‘unit_name_is_valid.part.0’
systemd-stable-255.4/src/basic/unit-name.c:65:31: warning[-Wanalyzer-deref-before-check]: check of ‘at’ for NULL after already dereferencing it
systemd-stable-255.4/src/basic/alloc-util.h:10: included_from: Included from here.
systemd-stable-255.4/src/basic/unit-name.c:10: included_from: Included from here.
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:714:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:13: included_from: Included from here.
systemd-stable-255.4/src/basic/macro.h:148:21: note: in expansion of macro ‘_unlikely_’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:715:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:715:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:148:21: note: in expansion of macro ‘_unlikely_’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:716:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:716:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/unit-name.c: scope_hint: In function ‘unit_name_is_valid.part.0’
systemd-stable-255.4/src/basic/unit-name.c: scope_hint: In function ‘unit_name_is_valid.part.0’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:45:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/unit-name.c:47:13: note: in expansion of macro ‘_unlikely_’
systemd-stable-255.4/src/basic/unit-name.c: scope_hint: In function ‘unit_name_is_valid.part.0’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:672:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:148:21: note: in expansion of macro ‘_unlikely_’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:673:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:673:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/macro.h:392: included_from: Included from here.
systemd-stable-255.4/src/basic/log.h:212:31: note: in definition of macro ‘log_full_errno_zerook’
systemd-stable-255.4/src/basic/unit-name.c:766:17: note: in expansion of macro ‘log_full’
systemd-stable-255.4/src/basic/log.h:236:24: note: in expansion of macro ‘log_full_errno_zerook’
systemd-stable-255.4/src/basic/unit-name.c:766:17: note: in expansion of macro ‘log_full’
systemd-stable-255.4/src/basic/log.h:236:24: note: in expansion of macro ‘log_full_errno_zerook’
systemd-stable-255.4/src/basic/unit-name.c:766:17: note: in expansion of macro ‘log_full’
systemd-stable-255.4/src/basic/macro.h:165:22: note: in expansion of macro ‘assert_message_se’
systemd-stable-255.4/src/basic/unit-name.c:45:9: note: in expansion of macro ‘assert’
systemd-stable-255.4/src/basic/unit-name.c:47:13: note: in expansion of macro ‘_unlikely_’
#   63|           for (i = n, at = NULL; i < e; i++) {
#   64|   
#   65|->                 if (*i == '@' && !at)
#   66|                           at = i;
#   67|