New Coverity issues from new scanner/parser

[Jaap Keuter <jaap.keuter () xs4all nl>]

Hi list,

After the merge of change 14719 
(https://code.wireshark.org/review/#/c/14719/) a new series of 50 
Coverity issues (CID-1358125 .. CID-1358175) has been recorded.
They all indicate the same issue in every instantiation of the scanner, 
a "Dereference after null check" issue, eg.

    CID 1358154 (#1 of 1): Dereference after null check (FORWARD_NULL)8. 
var_deref_op: Dereferencing null pointer yyg->yy_buffer_stack.
1254                        YY_CURRENT_BUFFER_LVALUE =
/wiretap/k12text.c
287#define YY_CURRENT_BUFFER_LVALUE 
yyg->yy_buffer_stack[yyg->yy_buffer_stack_top]
1255                                
k12text__create_buffer(yyin,YY_BUF_SIZE ,yyscanner);

While this work is fresh, could this be addressed?

Thanks,
Jaap

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