qemu: domain: gfx: Fix shadowing of a function argument in validation

Since the code was never run, it would have been very hard to spot this
mistake, especially since the compiler can't really warn about it.
Signed-off-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_domain.c

@@ -5783,9 +5783,7 @@ qemuDomainDeviceDefValidateGraphics(const virDomainGraphicsDef *graphics,
     size_t i;
 
     for (i = 0; i < def->ngraphics; i++) {
-        graphics = def->graphics[i];
-
-        if (graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS) {
+        if (def->graphics[i]->type == VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS) {
             have_egl_headless = true;
             break;
         }