Fix compatibility with GNU g++ 6.3 compiler.

Author: c-lipka

source/base/image/openexr.cpp

@@ -101,7 +101,7 @@ class POV_EXR_OStream : public Imf::OStream
 
 		void write(const char *c, int n)
 		{
-			if(os.write(c, n) == false)
+			if(!os.write(c, n))
 				throw POV_EXCEPTION(kFileDataErr, "Error while writing EXR output");
 		}
 
@@ -115,7 +115,7 @@ class POV_EXR_OStream : public Imf::OStream
 
 		void seekp(Int64 pos)
 		{
-			if(os.seekg((unsigned long)pos) == false)
+			if(!os.seekg((unsigned long)pos))
 				throw POV_EXCEPTION(kFileDataErr, "Error when writing EXR output");
 		}
 	private:
@@ -142,7 +142,7 @@ class POV_EXR_IStream : public Imf::IStream
 
 		bool read(char *c, int n)
 		{
-			if(is.read(c, n) == false)
+			if(!is.read(c, n))
 				throw POV_EXCEPTION(kFileDataErr, "Error while reading EXR file");
 			return (is.tellg() < fsize);
 		}
@@ -157,7 +157,7 @@ class POV_EXR_IStream : public Imf::IStream
 
 		void seekg(Int64 pos)
 		{
-			if(is.seekg((unsigned long)pos) == false)
+			if(!is.seekg((unsigned long)pos))
 				throw POV_EXCEPTION(kFileDataErr, "Error while reading EXR file");
 		}
 	private: