Ensure page_size is always at least 1

This avoids potential divisions by 0, and possibly also other mistakes
in case of malformed avrdude.conf entries.

The solution is different than the one in patch #9820 but is supposed
to cover that condition as well.

patch #9820: Fix some out-of-bounds/uninitialized issues



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1436 81a1dc3b-b13d-400b-aceb-764788c761c2

avrpart.c

@@ -254,6 +254,7 @@ AVRMEM * avr_new_memtype(void)
   }
 
   memset(m, 0, sizeof(*m));
+  m->page_size = 1; // ensure not 0
 
   return m;
 }