Fix spelling errors in QTgaFile messages.

Change-Id: I967f20698d161a52365c9bfea68ca0c7596b998b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

src/plugins/imageformats/tga/qtgafile.cpp

@@ -149,7 +149,7 @@ QTgaFile::QTgaFile(QIODevice *device)
     int bytes = device->read((char*)mHeader, HeaderSize);
     if (bytes != HeaderSize)
     {
-        mErrorMessage = tr("Image mHeader read failed");
+        mErrorMessage = tr("Image header read failed");
         return;
     }
     if (mHeader[ImageType] != 2)
@@ -162,7 +162,7 @@ QTgaFile::QTgaFile(QIODevice *device)
     bool validDepth = (bitsPerPixel == 16 || bitsPerPixel == 24 || bitsPerPixel == 32);
     if (!validDepth)
     {
-        mErrorMessage = tr("Image dpeth not valid");
+        mErrorMessage = tr("Image depth not valid");
     }
     int curPos = mDevice->pos();
     int fileBytes = mDevice->size();