Fix phypOpen() escape_specialcharacters

Fix phypOpen() escape_specialcharacters

Matthias correctly points out that escape_specialcharaters() takes a
length, and since we are now malloc()'ing string in phypOpen instead of
making it a static array, we can't use sizeof(string) anymore.  Calculate
the proper strlen and then use that both to allocate the string and also
pass it to escape_specialcharacters().

Signed-off-by: Chris Lalancette <clalance@redhat.com>