Avoid use of partly initialized VModInfo in error path

Avoid use of partly initialized VModInfo in error path

Such as:

Compiling path: ./test/data/bad.xkb  mapName:
==1300== Conditional jump or move depends on uninitialised value(s)
==1300==    at 0x4E46166: HandleVModDef (vmod.c:90)
==1300==    by 0x4E3FEC9: HandleKeyTypesFile (keytypes.c:1035)
==1300==    by 0x4E3FBE1: HandleIncludeKeyTypes.constprop.11 (keytypes.c:387)
==1300==    by 0x4E401DD: HandleKeyTypesFile (keytypes.c:1022)
==1300==    by 0x4E3FBE1: HandleIncludeKeyTypes.constprop.11 (keytypes.c:387)
==1300==    by 0x4E401DD: HandleKeyTypesFile (keytypes.c:1022)
==1300==    by 0x4E4026F: CompileKeyTypes (keytypes.c:1150)
==1300==    by 0x4E3DF9B: CompileKeymap (keymap.c:169)
==1300==    by 0x4E465E9: compile_keymap (xkbcomp.c:205)
==1300==    by 0x4E46BE4: xkb_compile_keymap_from_file (xkbcomp.c:290)
==1300==    by 0x400B37: test_file (filecomp.c:47)
==1300==    by 0x4008E3: main (filecomp.c:90)
==1300==  Uninitialised value was created by a stack allocation
==1300==    at 0x4E3FB3F: HandleIncludeKeyTypes.constprop.11 (keytypes.c:366)

Signed-off-by: Ran Benita <ran234@gmail.com>