c-common.c (check_format_types): Check for writing through a NULL pointer argument.
* c-common.c (check_format_types): Check for writing through a NULL pointer argument. testsuite: * gcc.dg/c90-printf-1.c, gcc.dg/c90-scanf-1.c: Add tests for writing through null pointers; remove comment about testing unterminated strings. From-SVN: r36936
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