ccmake: Add missing initializers reported by cppcheck

The return statement uses d1, d2, d3, and d4 variables but the code
which initialize them inside a if statement and not always this if
statement is corrent.  On the other hand these variables are using for
return statement and needed to be initialized.  A trivial fix to pervent
some compilers will give build error.

Reviewed-by: Igor Murzov <e-mail@date.by>

Source/CursesDialog/form/fty_ipv4.c

@@ -30,7 +30,7 @@ static bool Check_IPV4_Field(FIELD * field, const void * argp)
 {
   char *bp = field_buffer(field,0);
   int num = 0, len;
-  unsigned int d1, d2, d3, d4;
+  unsigned int d1=256, d2=256, d3=256, d4=256;
 
   argp=0; /* Silence unused parameter warning.  */