[eacsl] Fix init_function.c test

src/plugins/e-acsl/tests/memory/init_function.c

 /* run.config
-  COMMENT: Check if the instrumentation engine still adds __e_acsl_memory init
-  COMMENT: is inserted for the case when no malloc is used but no no variable
-  COMMENT: is required tracking
+  COMMENT: Check that the instrumentation engine still adds __e_acsl_memory_init
+  COMMENT: if no variable is instrumented.
+  STDOPT: +"-eva-no-builtins-auto"
 */
 
 #include <stdlib.h>
 
+extern size_t __e_acsl_heap_allocation_size;
+
 int main(void) {
-    /* @assert (__heap_allocation_size == 0);  */
-    char *a = malloc(7);
-    /* @assert (__heap_allocation_size == 7);  */
+  // The asserts check that the memory model of E-ACSL is correctly initialized
+  // and updated, but since no memory predicate is used the variable `a` does
+  // not need to be instrumented (ie. no `store_block` and `delete_block` are
+  // generated).
+  /*@ assert __e_acsl_heap_allocation_size == 0;  */
+  char *a = malloc(7);
+  /*@ assert __e_acsl_heap_allocation_size == 7;  */
 }