svgicons: Prevent a crash in case of a problem with the SVG image.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

tdecore/svgicons/ksvgiconpainter.cpp

@@ -217,6 +217,10 @@ public:
 			return;
 
 		ArtRender *render = art_render_new(0, 0, m_width, m_height, m_buffer, m_rowstride, 3, 8, ART_ALPHA_SEPARATE, 0);
+		if(!render)
+		{
+			return;
+		}
 		art_render_svp(render, svp);
 
 		art_render_mask_solid(render, (opacity << 8) + opacity + (opacity >> 7));
@@ -475,6 +479,10 @@ public:
 			linear->c = -(x1n * linear->a + y1n * linear->b);
 
 			ArtRender *render = art_render_new(0, 0, m_width, m_height, m_buffer, m_rowstride, 3, 8, ART_ALPHA_SEPARATE, 0);
+			if(!render)
+			{
+				return;
+			}
 			art_render_svp(render, svp);
 
 			art_render_gradient_linear(render, linear, ART_FILTER_HYPER);
@@ -546,6 +554,10 @@ public:
 			art_affine_invert(radial->affine, aff1);
 
 			ArtRender *render = art_render_new(0, 0, m_width, m_height, m_buffer, m_rowstride, 3, 8, ART_ALPHA_SEPARATE, 0);
+			if(!render)
+			{
+				render;
+			}
 			art_render_svp(render, svp);
 
 			art_render_gradient_radial(render, radial, ART_FILTER_HYPER);