Merge branch 'testfix' into 'master'

Zero terminate temp buffers before calling strcat.

See merge request cairo/cairo!369

test/pdf-operators-text.c

@@ -127,6 +127,7 @@ draw (cairo_t *cr, int width, int height)
     cairo_set_font_size (cr, FONT_SIZE);
 
     text = malloc (strlen(WORD) * NUM_WORDS + 1);
+    text[0] = '\0';
     for (i = 0; i < NUM_WORDS; i++)
 	strcat (text, WORD);