paranoid check that RNA string functions set the string, would have helped solve keymap search bug.

disabled in release mode.

source/blender/makesrna/intern/rna_access.c

@@ -2216,8 +2216,17 @@ char *RNA_property_string_get_alloc(PointerRNA *ptr, PropertyRNA *prop, char *fi
 	else
 		buf= MEM_mallocN(sizeof(char)*(length+1), "RNA_string_get_alloc");
 
+#ifndef NDEBUG
+	/* safety check to ensure the string is actually set */
+	buf[length]= 255;
+#endif
+
 	RNA_property_string_get(ptr, prop, buf);
 
+#ifndef NDEBUG
+	BLI_assert(buf[length] == '\0');
+#endif
+
 	return buf;
 }