SAM_CortexM0P HAL accesses uninitialized memory

Uses uninitialized memory in I2C, and accesses an out of band array in pwmout

Author: janjongboom

targets/TARGET_Atmel/TARGET_SAM_CortexM0P/i2c_api.c

@@ -173,7 +173,7 @@ void i2c_frequency(i2c_t *obj, int hz)
     int32_t baud_rate;
     int32_t tmp_baud;
     int32_t tmp_baud_hs;
-    enum status_code tmp_status_code;
+    enum status_code tmp_status_code = STATUS_OK;
 
     /* Sanity check arguments */
     MBED_ASSERT(obj);

targets/TARGET_Atmel/TARGET_SAM_CortexM0P/pwmout_api.c

@@ -60,7 +60,7 @@ static void pwmout_set_period(pwmout_t* obj, int period_us)
 
     freq_hz = system_gclk_gen_get_hz(obj->clock_source);
 
-    for (i=0; i<sizeof(tcc_prescaler); i++) {
+    for (i=0; i<sizeof(tcc_prescaler) / sizeof(tcc_prescaler[0]); i++) {
         div_freq = freq_hz >> tcc_prescaler[i];
         if (!div_freq) break;
         us_per_cycle = 1000000.00 / div_freq;