fixed a possible segfault in an out of mem condition. Fixed build for Haiku, since libpng.a and libz.a are not build for Haiku it seems. Is there a specific reason to link them statically? These are system libs after all.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12813 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/translators/pngtranslator/Jamfile

@@ -17,7 +17,13 @@ Translator PNGTranslator :
 	PNGTranslator.cpp
 	PNGView.cpp ;
 
-LinkSharedOSLibs PNGTranslator : be translation libpng.a libz.a ;
+if ( $(TARGET_PLATFORM) = haiku ) {
+	LinkSharedOSLibs PNGTranslator :
+		libbe.so libtranslation.so libpng.so libz.so ;
+} else {
+	LinkSharedOSLibs PNGTranslator :
+		be translation libpng.a libz.a ;
+}
 
 Package haiku-translationkit-cvs :
 	PNGTranslator :

src/add-ons/translators/pngtranslator/PNGTranslator.cpp

@@ -819,7 +819,7 @@ PNGTranslator::translate_from_bits_to_png(BPositionIO *inSource,
 			result = B_ERROR;
 			break;
 		}
-		
+
 		png_set_write_fn(ppng, static_cast<void *>(outDestination), 
 			pngcb_write_data, pngcb_flush_data);
 			
@@ -849,6 +849,10 @@ PNGTranslator::translate_from_bits_to_png(BPositionIO *inSource,
 			}
 			if (nalloc < height) {
 				result = B_NO_MEMORY;
+				// clear out rest of the pointers,
+				// so we don't call delete[] with invalid pointers
+				for (; nalloc < height; nalloc++)
+					prows[nalloc] = NULL;
 				break;
 			}
 		}