cmMakefile: Collapse two consecutive if()s into one

Source/cmMakefile.cxx

@@ -1230,20 +1230,17 @@ void cmMakefile::AddLinkLibraryForTarget(const std::string& target,
   }
 
   cmTarget* tgt = this->GetGlobalGenerator()->FindTarget(lib);
-  if (tgt) {
-    // if it is not a static or shared library then you can not link to it
-    if ((tgt->GetType() != cmState::STATIC_LIBRARY) &&
-        (tgt->GetType() != cmState::SHARED_LIBRARY) &&
-        (tgt->GetType() != cmState::INTERFACE_LIBRARY) &&
-        !tgt->IsExecutableWithExports()) {
-      std::ostringstream e;
-      e << "Target \"" << lib << "\" of type "
-        << cmState::GetTargetTypeName(tgt->GetType())
-        << " may not be linked into another target.  "
-        << "One may link only to STATIC or SHARED libraries, or "
-        << "to executables with the ENABLE_EXPORTS property set.";
-      this->IssueMessage(cmake::FATAL_ERROR, e.str());
-    }
+  if (tgt && (tgt->GetType() != cmState::STATIC_LIBRARY) &&
+      (tgt->GetType() != cmState::SHARED_LIBRARY) &&
+      (tgt->GetType() != cmState::INTERFACE_LIBRARY) &&
+      !tgt->IsExecutableWithExports()) {
+    std::ostringstream e;
+    e << "Target \"" << lib << "\" of type "
+      << cmState::GetTargetTypeName(tgt->GetType())
+      << " may not be linked into another target.  "
+      << "One may link only to STATIC or SHARED libraries, or "
+      << "to executables with the ENABLE_EXPORTS property set.";
+    this->IssueMessage(cmake::FATAL_ERROR, e.str());
   }
   i->second.AddLinkLibrary(*this, target, lib, llt);
 }