#3370 crash on array declaration with extra braces after function definition

[Philipp Klaus Krause]

The following code makes current SDCC crash:

void f (void)
{
}

const int i[]={{1,2},{3,4}};

Depending on the port, I see either a segfault, or an

Internal error: validateLink failed in SPEC_NOUN(type) @ SDCCsymt.c:3819: expected SPECIFIER, got UNKNOWN