samples: kernel: condition_variables: Remove unneeded tstack extern

This commit removes the `tstack` symbol extern that is not used
anywhere in this sample.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

samples/kernel/condition_variables/condvar/src/main.c

@@ -18,7 +18,6 @@ K_CONDVAR_DEFINE(count_threshold_cv);
 
 #define STACK_SIZE (1024 + CONFIG_TEST_EXTRA_STACK_SIZE)
 
-K_THREAD_STACK_EXTERN(tstack);
 K_THREAD_STACK_ARRAY_DEFINE(tstacks, NUM_THREADS, STACK_SIZE);
 
 static struct k_thread t[NUM_THREADS];

samples/kernel/condition_variables/simple/src/main.c

@@ -11,7 +11,6 @@
 #define NUM_THREADS 20
 #define STACK_SIZE (1024 + CONFIG_TEST_EXTRA_STACK_SIZE)
 
-K_THREAD_STACK_EXTERN(tstack);
 K_THREAD_STACK_ARRAY_DEFINE(tstacks, NUM_THREADS, STACK_SIZE);
 
 static struct k_thread t[NUM_THREADS];