samples(Fib): fix warnings in thread.cpp (use snprintf, return) and ignore build artifacts

Author: Subham-KRLX

.gitignore

@@ -13,3 +13,7 @@ OneLocBuild
 
 # ignore imported localization xlf directory
 vscode-translations-import
+
+# Ignore Fib sample build artifacts
+Code Samples/Fib/fib.out
+Code Samples/Fib/fib.out.dSYM/

Code Samples/Fib/thread.cpp

@@ -24,7 +24,7 @@ void * thread_proc(void* ctx)
     int tid = g_tid++;
 
     char thread_name[16];
-    sprintf(thread_name, "Thread %d", tid);
+    snprintf(thread_name, sizeof(thread_name), "Thread %d", tid);
 #ifdef __APPLE__
     pthread_setname_np(thread_name);
 #else
@@ -45,4 +45,5 @@ void * thread_proc(void* ctx)
     }
 
     std::cout << thread_name << " exited!" << std::endl;
+    return nullptr;
 }