Fix deserialize nested map error in objc client

modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache

@@ -413,7 +413,7 @@ static void (^reachabilityChangeBlock)(int);
     }
 
     // map
-    NSString *dictPat = @"NSDictionary\\* /\\* (.+), (.+) \\*/";
+    NSString *dictPat = @"NSDictionary\\* /\\* (.+?), (.+) \\*/";
     regexp = [NSRegularExpression regularExpressionWithPattern:dictPat
                                                        options:NSRegularExpressionCaseInsensitive
                                                          error:nil];

samples/client/petstore/objc/SwaggerClient/SWGApiClient.m

@@ -413,7 +413,7 @@ static void (^reachabilityChangeBlock)(int);
     }
 
     // map
-    NSString *dictPat = @"NSDictionary\\* /\\* (.+), (.+) \\*/";
+    NSString *dictPat = @"NSDictionary\\* /\\* (.+?), (.+) \\*/";
     regexp = [NSRegularExpression regularExpressionWithPattern:dictPat
                                                        options:NSRegularExpressionCaseInsensitive
                                                          error:nil];

samples/client/petstore/objc/SwaggerClientTests/Tests/DeserializationTest.m

@@ -116,4 +116,19 @@
     XCTAssertEqualObjects([result[@"pet"] _id], @119);
 }
 
+- (void)testDeserializeNestedMap {
+    NSDictionary *data =
+    @{
+      @"foo": @{
+              @"bar": @1
+              }
+    };
+    
+    NSDictionary *result = [apiClient deserialize:data class:@"NSDictionary* /* NSString, NSDictionary* /* NSString, NSNumber */ */"];
+    
+    XCTAssertTrue([result isKindOfClass:[NSDictionary class]]);
+    XCTAssertTrue([result[@"foo"] isKindOfClass:[NSDictionary class]]);
+    XCTAssertTrue([result[@"foo"][@"bar"] isKindOfClass:[NSNumber class]]);
+}
+
 @end