games-puzzle/xwelltris: tweak for gcc-11

Reported-by: Agostino Sarubbo
Closes: https://bugs.gentoo.org/739318
Package-Manager: Portage-3.0.18, Repoman-3.0.3
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

games-puzzle/xwelltris/files/xwelltris-1.0.1-gcc-11.patch

@@ -0,0 +1,11 @@
+--- a/src/sdl/sdlwelldrawing.cxx
++++ b/src/sdl/sdlwelldrawing.cxx
+@@ -72,7 +72,7 @@ void SDLWellDrawingEngine::init(int inum_fields, int idx, int idy,
+ 
+ 	fields[i]=SDL_DisplayFormat(surface);
+ 	SDL_FreeSurface(surface);
+-	if(fields[i]>0)
++	if(fields[i])
+ 	    clear_field(i);
+     }
+     bg_color=colors[BackColor];

games-puzzle/xwelltris/xwelltris-1.0.1.ebuild

@@ -25,6 +25,7 @@ RDEPEND="
 PATCHES=(
 	# Look in ${EPREFIX}/var/lib/xwelltris for score file
 	"${FILESDIR}"/${PN}-1.0.1-scorefile-dir.patch
+	"${FILESDIR}"/${PN}-1.0.1-gcc-11.patch
 )
 
 src_prepare() {