commit d1e8054014adeafc606885844c1df65918ee7511
Author: Daniel Kolesa <daniel@octaforge.org>
Date:   Fri Apr 8 05:26:02 2022 +0200

    fix up some invalid nullptr assignments
    
    C++11 onwards permits NULL to be of type nullptr_t, which prevents
    assignment of NULL values to integer types.

diff --git a/samples/source/common/DumpFile.cpp b/samples/source/common/DumpFile.cpp
index e3d8888..5d86bbb 100644
--- a/samples/source/common/DumpFile.cpp
+++ b/samples/source/common/DumpFile.cpp
@@ -2471,7 +2471,7 @@ DumpISOBoxes(LFA_FileRef file, XMP_Uns32 maxBoxLen, std::string _isoPath)
 					DumpTIFF(tiffContent, tiffLength, offset, "HEIF Exif", "HEIF:Exif");
 					LFA_Seek(file, keep, SEEK_SET, &ok);
 					assertMsg("seek failed", ok);
-					exif_item_id = NULL;
+					exif_item_id = 0;
 				}
 			}
 			//Get the data for xmp - using value from mime_item_id
@@ -2489,7 +2489,7 @@ DumpISOBoxes(LFA_FileRef file, XMP_Uns32 maxBoxLen, std::string _isoPath)
 					DumpXMP(xmpContent, xmpLength, offset, "XMP");
 					LFA_Seek(file, keep, SEEK_SET, &ok);
 					assertMsg("seek failed", ok);
-					mime_item_id = NULL;
+					mime_item_id = 0;
 				}
 			}
 			break;
@@ -2641,7 +2641,7 @@ DumpISOBoxes(LFA_FileRef file, XMP_Uns32 maxBoxLen, std::string _isoPath)
 					DumpTIFF(tiffContent, tiffLength, offset, "HEIF Exif", "HEIF:Exif");
 					LFA_Seek(file, keep, SEEK_SET, &ok);
 					assertMsg("seek failed", ok);
-					exif_item_id = NULL;
+					exif_item_id = 0;
 				}
 			}
 			//Get the data for xmp - using value from mime_item_id
@@ -2659,7 +2659,7 @@ DumpISOBoxes(LFA_FileRef file, XMP_Uns32 maxBoxLen, std::string _isoPath)
 					DumpXMP(xmpContent, xmpLength, offset, "XMP");
 					LFA_Seek(file, keep, SEEK_SET, &ok);
 					assertMsg("seek failed", ok);
-					mime_item_id = NULL;
+					mime_item_id = 0;
 				}
 			}