[RuboCop] Refactor validator checking of file patterns

lib/cocoapods/validator.rb

@@ -399,13 +399,8 @@ module Pod
       end
 
       if consumer.spec.root?
-        unless file_accessor.license || spec.license && (spec.license[:type] == 'Public Domain' || spec.license[:text])
-          warning('license', 'Unable to find a license file')
-        end
-
-        if spec.module_map && !file_accessor.module_map.exist?
-          error('module_map', "Unable to find the specified module map file.")
-        end
+        _validate_license
+        _validate_module_map
       end
     end
 
@@ -417,6 +412,18 @@ module Pod
       _validate_header_files(:public_header_files)
     end
 
+    def _validate_license
+      unless file_accessor.license || spec.license && (spec.license[:type] == 'Public Domain' || spec.license[:text])
+        warning('license', 'Unable to find a license file')
+      end
+    end
+
+    def _validate_module_map
+      if spec.module_map && !file_accessor.module_map.exist?
+        error('module_map', 'Unable to find the specified module map file.')
+      end
+    end
+
     # Ensures that a list of header files only contains header files.
     #
     def _validate_header_files(attr_name)