Add zalloc(size_t) allocator function

Same as calloc(1, len).

src/Makefile.am

@@ -46,6 +46,7 @@ weston_SOURCES =				\
 	pixman-renderer.h			\
 	../shared/matrix.c			\
 	../shared/matrix.h			\
+	../shared/zalloc.h			\
 	weston-launch.h				\
 	weston-egl-ext.h
 

src/compositor.h

@@ -37,6 +37,7 @@ extern "C" {
 #include "version.h"
 #include "matrix.h"
 #include "config-parser.h"
+#include "zalloc.h"
 
 #ifndef MIN
 #define MIN(x,y) (((x) < (y)) ? (x) : (y))