staging: zram: make global var "num_devices" use unique name
The global variable "num_devices" is too general to be global. This patch switches the name to be "zram_num_devices". Signed-off-by: NNoah Watkins <noahwatkins@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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