ANDROID: cpufreq: brcmstb-avs-cpufreq: fix build error

In commit d951cf51 ("cpufreq: brcmstb-avs-cpufreq: add check for
cpufreq_cpu_get's return value"), a check is made in a way that causes a
build warning, which in Android systems, breaks the build.  Fix this up
by moving the definition of the variable above the check to remove the
warning.

Fixes: d951cf51 ("cpufreq: brcmstb-avs-cpufreq: add check for cpufreq_cpu_get's return value")
Change-Id: I8477905e3447eb4eabf3aa0899534c06a0cca125
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>