scsi: megaraid_sas: Protect megasas_get_ctrl_info() in megasas_resume()

Protect the megasas_get_ctrl_info() call in megasas_resume() with
instance->reset_mutex using scoped_guard().

megasas_get_ctrl_info() may release and reacquire instance->reset_mutex.
Hence, calling this function without holding instance->reset_mutex is not
safe.

Fixes: c3b10a55abc9 ("scsi: megaraid_sas: Update controller info during resume")
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/f06b5ee432b21cf293f0663e15b64f75a84b9fd5.1788204406.git.bvanassche@acm.org
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>