vmcoreinfo: add kallsyms_num_syms symbol

The rest of the kallsyms symbols are useless without knowing the number of
symbols in the table.  In an earlier patch, I somehow dropped the
kallsyms_num_syms symbol, so add it back in.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 5fd8fea ("vmcoreinfo: include kallsyms symbols")
Signed-off-by: Stephen Brennan <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: brenns10

kernel/crash_core.c

@@ -494,6 +494,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 
 #ifdef CONFIG_KALLSYMS
 	VMCOREINFO_SYMBOL(kallsyms_names);
+	VMCOREINFO_SYMBOL(kallsyms_num_syms);
 	VMCOREINFO_SYMBOL(kallsyms_token_table);
 	VMCOREINFO_SYMBOL(kallsyms_token_index);
 #ifdef CONFIG_KALLSYMS_BASE_RELATIVE