gdbparser: fix compile warnings

[UffeJakobsen]

gdbparser: fix compile warnings

32% 498/1526: 1028/1/498: 421.261 1.2 ?: Building CXX object gdbparser/CMakeFiles/gdbparser.dir/main.cpp.o
/tmp/codelite-devel.git/gdbparser/main.cpp: In function `bool testChildrenParser()':
/tmp/codelite-devel.git/gdbparser/main.cpp:98:1: warning: control reaches end of non-void function
[-Wreturn-type]
   98 | }
      | ^
/tmp/codelite-devel.git/gdbparser/main.cpp: In function `bool testTokens()':
/tmp/codelite-devel.git/gdbparser/main.cpp:142:9: warning: control reaches end of non-void
function [-Wreturn-type]
  142 |     free(l);
      |     ~~~~^~~
``'