LeakSanitizer reports memory leak in config file parser

[ewxrjk]

Environment

export UBSAN_OPTIONS=print_stacktrace\=1
export CXX=clang\+\+\-14\ \ \-Wno\-deprecated\-copy
export LC_CTYPE=en_GB\.UTF\-8
export CFLAGS=\-fsanitize\=address\,undefined\,integer\,nullability\ \-O0\ \-fno\-optimize\-sibling\-calls\ \-fno\-omit\-frame\-pointer\ \-fno\-sanitize\-recover\=all\ \-g
export CC=clang\-14
export CXXFLAGS=\-fsanitize\=address\,undefined\,integer\,nullability\ \-O0\ \-fno\-optimize\-sibling\-calls\ \-fno\-omit\-frame\-pointer\ \-fno\-sanitize\-recover\=all\ \-g\ \-Wno\-deprecated\-copy

Error

*                                                                                                                                                                                                           
*                                =================================================================                                                                                                          
*                                ==140010==ERROR: LeakSanitizer: detected memory leaks                                                                                                                      
*                                                                                                                                                                                                           
*                                Direct leak of 11 byte(s) in 1 object(s) allocated from:                                                                                                                   
*                                    #0 0x55b7b8ebc3ce in __interceptor_malloc (/var/lib/build/_builds/clang-sanitizers/sftpserver/gesftpserver+0xda3ce) (BuildId: a8816a334a9ba78f8ebddcccb90949de47333bbf)
*                                    #1 0x55b7b8f0a9ca in sftp_xmalloc /var/lib/build/_builds/clang-sanitizers/sftpserver/utils.c:59:14                                                                     
*                                    #2 0x55b7b8f4233b in sftpconf_split /var/lib/build/_builds/clang-sanitizers/sftpserver/sftpconf.c:33:18                                                                
*                                    #3 0x55b7b8f41974 in sftpconf_read /var/lib/build/_builds/clang-sanitizers/sftpserver/sftpconf.c:82:21                                                                 
*                                    #4 0x55b7b8ef7809 in main /var/lib/build/_builds/clang-sanitizers/sftpserver/sftpserver.c:507:3                                                                        
*                                    #5 0x7f4ffce9b189 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16                                                                           
*                                                                                                                                                                                                           
*                                SUMMARY: AddressSanitizer: 11 byte(s) leaked in 1 allocation(s).