modpost: Initialize builtin_modname to stop SIGSEGVs

Segmentation fault ./scripts/mod/modpost -o vmlinux.symvers vmlinux.o
stops the kernel build.  It comes when write_vmlinux_export_c_file()
tries to buf_printf alias->builtin_modname.  malloc'ed memory is not
necessarily zeroed.  NULL new->builtin_modname before adding to aliases.

Fixes: 5ab23c7 ("modpost: Create modalias for builtin modules")
Signed-off-by: Hugh Dickins <[email protected]>
Reviewed-by: Nicolas Schier <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Nathan Chancellor <[email protected]>

Author: Hugh Dickins

scripts/mod/file2alias.c

@@ -94,6 +94,7 @@ module_alias_printf(struct module *mod, bool append_wildcard,
 		}
 	}
 
+	new->builtin_modname = NULL;
 	list_add_tail(&new->node, &mod->aliases);
 }