fix typos


To generate a diff of this commit:



	cvs diff -r5.28 -r5.29 krb5/src/lib/krb5/ccache/cc_file.c
	cvs diff -r5.12 -r5.13 krb5/src/lib/krb5/ccache/cc_memory.c
	cvs diff -r5.6 -r5.7 krb5/src/lib/krb5/ccache/cc_mslsa.c