Fix 'make dist' and 'make syntax-check'.

* tests/Makefile.am (EXTRA_DIST): Unconditionally distribute crash file.
* tests/crash-tftp-msg2021-12_18.bin: Renamed.
* cfg.mk (exclude_file_name_regexp--sc_trailing_blank)
(exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF): Add crash file.
* tests/tools.sh (srcdir): Set fallback srcdir.
* tests/tftp-regressions.sh: Use new filename in srcdir.

cfg.mk

@@ -64,7 +64,10 @@ exclude_file_name_regexp--sc_obsolete_symbols = \
 	^tests/identify.c$$
 
 exclude_file_name_regexp--sc_trailing_blank = \
-	^gl/top/README-release.diff$$
+	^(tests/crash-tftp-msg2021-12_18.bin|gl/top/README-release.diff)$$
+
+exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF = \
+	^tests/crash-tftp-msg2021-12_18.bin$$
 
 sc_unsigned_char:
 	@prohibit=u''_char \

tests/Makefile.am

@@ -20,7 +20,7 @@ AM_CPPFLAGS = $(iu_INCLUDES)
 
 LDADD = $(iu_LIBRARIES)
 
-EXTRA_DIST = tools.sh.in ifconfig_modes.sh
+EXTRA_DIST = tools.sh.in ifconfig_modes.sh crash-tftp-msg2021-12_18.bin
 
 noinst_PROGRAMS = identify
 identify_LDADD = $(top_builddir)/lib/libgnu.a $(LIBUTIL) $(PTY_LIB)
@@ -46,7 +46,6 @@ if ENABLE_traceroute
 dist_check_SCRIPTS += traceroute-localhost.sh
 endif
 if ENABLE_tftpd
-EXTRA_DIST += crash-tftp-msg2021-12_18
 dist_check_SCRIPTS += tftp-regressions.sh
 endif
 if ENABLE_inetd

tests/tftp-regressions.sh

@@ -52,7 +52,7 @@ RESULT=0
 # https://lists.gnu.org/archive/html/bug-inetutils/2021-12/msg00018.html
 EFFORTS=`expr $EFFORTS + 1`
 $silence echo 'Checking crash bug from message 2021-12/18...' >&2
-"$TFTP" < crash-tftp-msg2021-12_18 >/dev/null 2>&1
+"$TFTP" < $srcdir/crash-tftp-msg2021-12_18.bin >/dev/null 2>&1
 if test $? -ne 0; then
     $silence echo 'Regression of tftp crash bug from message 2021-12/18.' >&2
     RESULT=1