Fix build with -DNDEBUG in CFLAGS

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

block/vvfat.c

@@ -2462,10 +2462,13 @@ static int handle_commits(BDRVVVFATState* s)
 	    fail = -2;
 	    break;
 	case ACTION_WRITEOUT: {
+#ifndef NDEBUG
+            /* these variables are only used by assert() below */
 	    direntry_t* entry = array_get(&(s->directory),
 		    commit->param.writeout.dir_index);
 	    uint32_t begin = begin_of_direntry(entry);
 	    mapping_t* mapping = find_mapping_for_cluster(s, begin);
+#endif
 
 	    assert(mapping);
 	    assert(mapping->begin == begin);

linux-user/signal.c

@@ -412,7 +412,7 @@ static void QEMU_NORETURN force_sig(int target_sig)
 
     /* unreachable */
     assert(0);
-
+    abort();
 }
 
 /* queue a signal so that it will be send to the virtual CPU as soon

qdict.c

@@ -195,6 +195,7 @@ double qdict_get_double(const QDict *qdict, const char *key)
         return qint_get_int(qobject_to_qint(obj));
     default:
         assert(0);
+        return 0.0;
     }
 }
 

tcg/tcg.c

@@ -27,7 +27,7 @@
 
 #include "config.h"
 
-#ifndef CONFIG_DEBUG_TCG
+#if !defined(CONFIG_DEBUG_TCG) && !defined(NDEBUG)
 /* define it to suppress various consistency checks (faster) */
 #define NDEBUG
 #endif