cpufreq: pxa2xx: initialize variables

gcc-3.8 correctly found that the variables set by find_freq_tables()
are not initialized if this function is called on something other
than a pxa2xx or pxa3xx:

pxa2xx-cpufreq.c: In function 'pxa_verify_policy':
pxa2xx-cpufreq.c:272:6: warning: 'pxa_freqs_table' may be used uninitialized in this function [-Wmaybe-uninitialized]
pxa2xx-cpufreq.c: In function 'pxa_set_target':
pxa2xx-cpufreq.c:345:23: warning: 'pxa_freq_settings' may be used uninitialized in this function [-Wmaybe-uninitialized]

Rather than adding a bogus initialization that would let us
get a little further before crashing, add an explicit BUG().
We know that this code is designed to run on only these cpus,
so this will fix the build warning and give a more helpful
diagnostic if the code ever changes to run on other machines.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/pxa2xx-cpufreq.c

@@ -221,10 +221,11 @@ static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
 			*pxa_freqs = pxa255_turbo_freqs;
 			*freq_table = pxa255_turbo_freq_table;
 		}
-	}
-	if (cpu_is_pxa27x()) {
+	} else if (cpu_is_pxa27x()) {
 		*pxa_freqs = pxa27x_freqs;
 		*freq_table = pxa27x_freq_table;
+	} else {
+		BUG();
 	}
 }