Fix intermittent config store tests failures

Make the journal object in cfstore_test_startup static since the call
to FlashJournal_initialize keep a copy of this for future use. This fixes
an intermittent crash start started showing up when optimizations
were set to "-os".

Author: c1728p9

features/storage/FEATURE_STORAGE/TESTS/cfstore/example1/example1.cpp

@@ -273,7 +273,7 @@ static int32_t cfstore_test_startup(void)
 #ifdef CFSTORE_CONFIG_BACKEND_FLASH_ENABLED
 
     int32_t ret = ARM_DRIVER_ERROR;
-    FlashJournal_t jrnl;
+    static FlashJournal_t jrnl;
     extern ARM_DRIVER_STORAGE ARM_Driver_Storage_(0);
     const ARM_DRIVER_STORAGE *drv = &ARM_Driver_Storage_(0);
 

features/storage/FEATURE_STORAGE/TESTS/cfstore/example5/example5.cpp

@@ -166,7 +166,7 @@ int32_t cfstore_test_startup(void)
 
 #ifdef CFSTORE_CONFIG_BACKEND_FLASH_ENABLED
     int32_t ret = ARM_DRIVER_ERROR;
-    FlashJournal_t jrnl;
+    static FlashJournal_t jrnl;
     extern ARM_DRIVER_STORAGE ARM_Driver_Storage_(0);
     const ARM_DRIVER_STORAGE *drv = &ARM_Driver_Storage_(0);
 

features/storage/FEATURE_STORAGE/cfstore/source/cfstore_test.c

@@ -256,7 +256,7 @@ int32_t cfstore_test_startup(void)
 
 #ifdef CFSTORE_CONFIG_BACKEND_FLASH_ENABLED
 
-    FlashJournal_t jrnl;
+    static FlashJournal_t jrnl;
     extern ARM_DRIVER_STORAGE ARM_Driver_Storage_(0);
     const ARM_DRIVER_STORAGE *drv = &ARM_Driver_Storage_(0);