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Init top-level fstack node line number

It still gets written to the object file, generating Valgrind warnings
about using uninitialized memory. To silence those errors, and make
output more reproducible, init the line no to a dummy (0) value.

--- a/src/asm/fstack.c

+++ b/src/asm/fstack.c

@@ -539,6 +539,7 @@

 	context->fileInfo = (struct FileStackNode *)fileInfo;

 	/* lineNo and reptIter are unused on the top-level context */

 	context->fileInfo->parent = NULL;

+	context->fileInfo->lineNo = 0; // This still gets written to the object file, so init it

 	context->fileInfo->referenced = false;

 	context->fileInfo->type = NODE_FILE;

 	memcpy(fileInfo->name, fileName, len + 1);