Revert "fixes #25205 #14873; resets importc obj with nimZeroMem in specializeResetT for refc (#25207)"

This reverts commit 9628c7a4f8.

compiler/ccgreset.nim

@@ -66,14 +66,7 @@ proc specializeResetT(p: BProc, accessor: Rope, typ: PType) =
     var x = typ.baseClass
     if x != nil: x = x.skipTypes(skipPtrs)
     specializeResetT(p, accessor.parentObj(p.module), x)
-    if typ.n != nil:
-      if typ.sym != nil and sfImportc in typ.sym.flags:
-        # imported C struct, nimZeroMem
-        p.s(cpsStmts).addCallStmt(cgsymValue(p.module, "nimZeroMem"),
-          cCast(ptrType(CPointer), cAddr(accessor)),
-          cSizeof(getTypeDesc(p.module, typ)))
-      else:
-        specializeResetN(p, accessor, typ.n, typ)
+    if typ.n != nil: specializeResetN(p, accessor, typ.n, typ)
   of tyTuple:
     let typ = getUniqueType(typ)
     for i, a in typ.ikids:

tests/stdlib/tlocks.nim

@@ -9,30 +9,3 @@ import std/assertions
 
 var m = createMyType[int]()
 doAssert m.use() == 3
-
-
-import std/locks
-
-type
-  S = object
-    r: proc()
-
-  B = object
-    d: Lock
-    w: S
-
-proc v(x: ptr B) {.exportc.} = reset(x[])
-
-type
-  Test = object
-    path: string # Removing this makes both cases work.
-    lock: Lock
-
-# A: This is not fine.
-var a = Test()
-
-proc main(): void =
-  # B: This is fine.
-  var b = Test()
-
-main()