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malloc(), when passed zero size, may return NULL (the behavior is
implementation defined). Mirror the ->gov_num check to the other two
allocations as well. Don't chance then actually using a NULL in
print_cpufreq_para().
Fixes: 75e06d089d ("xenpm: add cpu frequency control interface, through which user can")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>