Fix errors found by cppcheck

Author: AMDmi3

src/RenderManager.cpp

@@ -400,7 +400,7 @@ void RenderManager::drawPolygon(std::vector<int> withArrayOfCoordinates, unsigne
   glVertexPointer(3, GL_FLOAT, 0, spotVertCoords);
   glDrawArrays(GL_TRIANGLE_FAN, 0, sizeOfArray >> 1);
 
-  delete spotVertCoords;
+  delete[] spotVertCoords;
 
   glPopMatrix();
 }

src/stb_image.c

@@ -3299,7 +3299,10 @@ static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
       skip(s, tga_palette_start );
       //   load the palette
       tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
-      if (!tga_palette) return epuc("outofmem", "Out of memory");
+      if (!tga_palette) {
+         free(tga_data);
+         return epuc("outofmem", "Out of memory");
+      }
       if (!getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) {
          free(tga_data);
          free(tga_palette);