wined3d: Fix uninitialised variable warnings.

dlls/wined3d/glsl_shader.c

@@ -12781,7 +12781,7 @@ static GLuint glsl_blitter_generate_program(struct wined3d_glsl_blitter *blitter
     enum complex_fixup complex_fixup = get_complex_fixup(args->fixup);
     struct wined3d_string_buffer *buffer, *output;
     GLuint program, vshader_id, fshader_id;
-    const char *tex_type, *swizzle, *ptr;
+    const char *tex_type = NULL, *swizzle = NULL, *ptr;
     unsigned int i;
     GLint loc;
 

dlls/wined3d/utils.c

@@ -2586,7 +2586,7 @@ static void check_fbo_compat(struct wined3d_caps_gl_ctx *ctx, struct wined3d_for
                 && format->format != GL_LUMINANCE && format->format != GL_LUMINANCE_ALPHA
                 && (format->f.red_size || format->f.alpha_size))
         {
-            DWORD readback[16 * 16 * 16], color, r_range, a_range;
+            DWORD readback[16 * 16 * 16], color = 0, r_range, a_range;
             BYTE r, a;
             BOOL match = TRUE;
             GLuint rb;