src: remove unprofessional slang in assertions

Convert `CHECK(0 && "wtf?")` (sic) assertions to more suitable
`UNREACHABLE()` macro invocations in `node_zlib.cc`.

PR-URL: #17166
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>

Author: aqrln

src/node_zlib.cc

@@ -314,7 +314,7 @@ class ZCtx : public AsyncWrap {
         }
         break;
       default:
-        CHECK(0 && "wtf?");
+        UNREACHABLE();
     }
 
     // pass any errors back to the main thread to deal with.
@@ -525,7 +525,7 @@ class ZCtx : public AsyncWrap {
             ->AdjustAmountOfExternalAllocatedMemory(kInflateContextSize);
         break;
       default:
-        CHECK(0 && "wtf?");
+        UNREACHABLE();
     }
 
     ctx->dictionary_ = reinterpret_cast<Bytef *>(dictionary);