Fix some FX_BOOL / int noise in fxcrt.

fpdfsdk/fpdf_dataavail.cpp

Index: fpdfsdk/fpdf_dataavail.cpp
diff --git a/fpdfsdk/fpdf_dataavail.cpp b/fpdfsdk/fpdf_dataavail.cpp
index 0bf67e9826c7c1056cf50080522223b6a3a084a5..45d3b2aa5d7affb686410d3a469c1d8906262407 100644
--- a/fpdfsdk/fpdf_dataavail.cpp
+++ b/fpdfsdk/fpdf_dataavail.cpp
@@ -67,9 +67,9 @@ class CFPDF_FileAccessWrap : public IFX_SeekableReadStream {
   // IFX_SeekableReadStream
   FX_FILESIZE GetSize() override { return m_pFileAccess->m_FileLen; }
 
-  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
-    return m_pFileAccess->m_GetBlock(m_pFileAccess->m_Param, offset,
-                                     (uint8_t*)buffer, size);
+  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
+    return !!m_pFileAccess->m_GetBlock(m_pFileAccess->m_Param, offset,
+                                       (uint8_t*)buffer, size);
   }
 
   void Release() override {}