Code cleanup: srand, PVS warnings (#1974)

* Remove srand invocation

* PVS High priority fixes

* PVS High errors part 2

* Furi: heap tracing inheritance

* Furi add __builtin_unreachable to furi_thread_catch

applications/main/subghz/subghz_i.c

@@ -513,12 +513,6 @@ bool subghz_path_is_file(FuriString* path) {
 }
 
 uint32_t subghz_random_serial(void) {
-    static bool rand_generator_inited = false;
-
-    if(!rand_generator_inited) {
-        srand(DWT->CYCCNT);
-        rand_generator_inited = true;
-    }
     return (uint32_t)rand();
 }