Merge branch 'master' of https://github.com/SDWebImage/SDWebImage into 5.x

# Conflicts:
#	CHANGELOG.md
#	SDWebImage.podspec
#	SDWebImage/SDWebImageDownloaderOperation.m
#	SDWebImage/SDWebImageWebPCoder.m
#	WebImage/Info.plist

CHANGELOG.md

@@ -1,3 +1,17 @@
+## [4.4.6 - 4.4 patch, on Feb 26th, 2019](https://github.com/SDWebImage/SDWebImage/releases/tag/4.4.6)
+See [all tickets marked for the 4.4.6 release](https://github.com/SDWebImage/SDWebImage/milestone/33)
+
+#### Fixes
+- Fix the unused user header search path warning for CocoaPods 1.6.0. #2622
+- Fix that WebP with custom ICC Profile will randomly crash, because `CGColorSpaceCreateWithICCProfile` does not copy the ICC data pointer #2621
+- Fix the issue when WebP contains the ICC Profile with colorSpace other than RGB, which cause the CGImageCreate failed #2627
+
+#### Project
+- Update the libwebp dependency to support using 1.0 version and above #2625
+
+#### Performances
+- Nil imageData before decode process to free memory #2624
+
 ## [5.0.0-beta5 - Customizable SDWebImage, on Jan 31st, 2019](https://github.com/rs/SDWebImage/releases/tag/5.0.0-beta5)
 See [all tickets marked for the 5.0.0-beta5 release](https://github.com/rs/SDWebImage/milestone/32)
 

SDWebImage/SDWebImageDownloaderOperation.m

@@ -206,7 +206,6 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
     } else {
         [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorInvalidDownloadOperation userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
         [self done];
-        return;
     }
 }
 
@@ -413,6 +412,7 @@ didReceiveResponse:(NSURLResponse *)response
     } else {
         if ([self callbacksForKey:kCompletedCallbackKey].count > 0) {
             NSData *imageData = [self.imageData copy];
+            self.imageData = nil;
             if (imageData) {
                 /**  if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
                  *  then we should check if the cached data is equal to image data