in the attempt to fix 627393, changed IFX_FileRead's readBlock to return the length it reads

core/fxge/android/cfpf_skiafontmgr.cpp

Index: core/fxge/android/cfpf_skiafontmgr.cpp
diff --git a/core/fxge/android/cfpf_skiafontmgr.cpp b/core/fxge/android/cfpf_skiafontmgr.cpp
index 6463e8b5311dafcc90656b02647c956f33b188e3..70d96582232942fd805610febe618fd7ea796bc0 100644
--- a/core/fxge/android/cfpf_skiafontmgr.cpp
+++ b/core/fxge/android/cfpf_skiafontmgr.cpp
@@ -33,7 +33,9 @@ static unsigned long FPF_SkiaStream_Read(FXFT_Stream stream,
   if (!pFileRead)
     return 0;
   if (count > 0) {
-    if (!pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count))
+    if (pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count) !=
+            static_cast<size_t>(count) &&
+        !pFileRead->IsEOF()) {
       return 0;
   }
   return count;