Noticing runtime error in socktools.cpp

[Kornel Benko]

Lyx compiled with -fsanitize=undefined gives this at start:

/usr2/src/lyx/lyx-git/src/support/socktools.cpp:121:56: runtime error: member access
within null pointer of type 'struct sockaddr_un' #0 0x5570c33ba6c8 in
lyx::support::socktools::listen(lyx::support::FileName const&, int)
/usr2/src/lyx/lyx-git/src/support/socktools.cpp:121:56 #1 0x5570c1975907 in
lyx::ServerSocket::ServerSocket(lyx::support::FileName const&)
/usr2/src/lyx/lyx-git/src/ServerSocket.cpp:55:8 #2 0x5570c17fe5ee in lyx::LyX::exec(int&,
char**) /usr2/src/lyx/lyx-git/src/LyX.cpp:370:32 #3 0x5570c1c6a4ba in main
/usr2/src/lyx/lyx-git/src/main.cpp:55:26 #4 0x7f91a048bd8f in __libc_start_call_main
csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #5 0x7f91a048be3f in __libc_start_main
csu/../csu/libc-start.c:392:3 #6 0x5570c112b154 in _start
(/usr9/BUILD/Mint21/BuildLyxGitQt6.2.4local-clang15.0.7/bin/lyx2.5+0x28fe154) (BuildId:
518d7aff388c7943507dd4632cba39cb3ae876cb)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
/usr2/src/lyx/lyx-git/src/support/socktools.cpp:121:56 in 


	Kornel
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