Don't use exit() if LOG_F will suffice
diff --git a/fuzz.c b/fuzz.c
index 97ded05..73c5d25 100644
--- a/fuzz.c
+++ b/fuzz.c
@@ -550,20 +550,20 @@
 
     if (state == _HF_STATE_DYNAMIC_MAIN) {
         if (!fuzz_prepareFileDynamically(hfuzz, fuzzer)) {
-            exit(EXIT_FAILURE);
+            LOG_F("fuzz_prepareFileDynamically() failed");
         }
     } else if (state == _HF_STATE_DYNAMIC_PRE) {
         fuzzer->flipRate = 0.0f;
         if (!fuzz_prepareFile(hfuzz, fuzzer, rnd_index)) {
-            exit(EXIT_FAILURE);
+            LOG_F("fuzz_prepareFile() failed");
         }
     } else if (hfuzz->externalCommand != NULL) {
         if (!fuzz_prepareFileExternally(hfuzz, fuzzer)) {
-            exit(EXIT_FAILURE);
+            LOG_F("fuzz_prepareFileExternally() failed");
         }
     } else {
         if (!fuzz_prepareFile(hfuzz, fuzzer, rnd_index)) {
-            exit(EXIT_FAILURE);
+            LOG_F("fuzz_prepareFile() failed");
         }
     }