Allow linker_search_symbol_name() to be called with KLD lock held. The linker_search_symbol_name() function is used by stack_print() and stack_print() can be called from kernel module unload method.
Allow linker_search_symbol_name() to be called with KLD lock held.
The linker_search_symbol_name() function is used by stack_print()
and stack_print() can be called from kernel module unload method.

MFC after:	1 week

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