Image: Log errors during image write when using OpenImageIO

Before this change, any accumulated errors from OpenImageIO would be
lost and a nonsensical use of `errno` would be used instead.

An example of the new error log:
```
00:23.188  image.write      | ERROR OpenImageIO write failed: sgi image resolution may not exceed 65535x65535, you asked for 65536x1
```

Pull Request: https://projects.blender.org/blender/blender/pulls/146554

source/blender/blenkernel/intern/image.cc

@@ -2569,7 +2569,7 @@ bool BKE_imbuf_write(ImBuf *ibuf, const char *filepath, const ImageFormatData *i
   BKE_image_format_to_imbuf(ibuf, imf);
 
   const bool ok = IMB_save_image(ibuf, filepath, IB_byte_data);
-  if (ok == 0) {
+  if (!ok && errno != 0) {
     perror(filepath);
   }
 

source/blender/imbuf/intern/oiio/openimageio_support.cc

@@ -23,6 +23,7 @@
 #include "CLG_log.h"
 
 static CLG_LogRef LOG_READ = {"image.read"};
+static CLG_LogRef LOG_WRITE = {"image.write"};
 
 OIIO_NAMESPACE_USING
 
@@ -132,7 +133,7 @@ static ImBuf *load_pixels(
   bool ok = in->read_image(
       0, 0, 0, channels, format, ibuf_data, ibuf_xstride, -ibuf_ystride, AutoStride);
   if (!ok) {
-    CLOG_ERROR(&LOG_READ, "OpenImageIO read failed: failed: %s", in->geterror().c_str());
+    CLOG_ERROR(&LOG_READ, "OpenImageIO read failed: %s", in->geterror().c_str());
 
     IMB_freeImBuf(ibuf);
     return nullptr;
@@ -364,7 +365,13 @@ bool imb_oiio_write(const WriteContext &ctx, const char *filepath, const ImageSp
     }
   }
 
-  return write_ok && close_ok;
+  const bool all_ok = write_ok && close_ok;
+  if (!all_ok) {
+    CLOG_ERROR(&LOG_WRITE, "OpenImageIO write failed: %s", out->geterror().c_str());
+    errno = 0; /* Prevent higher level layers from calling `perror` unnecessarily. */
+  }
+
+  return all_ok;
 }
 
 WriteContext imb_create_write_context(const char *file_format,