removed XINERAMA from config.mk and fixed a segfault when st is

started without a display. (thx Hiltjo Posthuma)

config.mk

@@ -10,16 +10,12 @@ MANPREFIX = ${PREFIX}/share/man
 X11INC = /usr/X11R6/include
 X11LIB = /usr/X11R6/lib
 
-# Xinerama, comment if you don't want it
-#XINERAMALIBS = -L${X11LIB} -lXinerama
-#XINERAMAFLAGS = -DXINERAMA
-
 # includes and libs
 INCS = -I. -I/usr/include -I${X11INC}
-LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 ${XINERAMALIBS}
+LIBS = -L/usr/lib -lc -L${X11LIB} -lX11
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+CPPFLAGS = -DVERSION=\"${VERSION}\"
 CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
 LDFLAGS = -s ${LIBS}
 

st.c

@@ -1078,10 +1078,9 @@ xhints(void)
 
 void
 xinit(void) {
-	xw.dis = XOpenDisplay(NULL);
-	xw.scr = XDefaultScreen(xw.dis);
-	if(!xw.dis)
+	if(!(xw.dis = XOpenDisplay(NULL)))
 		die("Can't open display\n");
+	xw.scr = XDefaultScreen(xw.dis);
 	
 	/* font */
 	if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))