Alphabetise message range checks. Simplify unneeded checks for NULL … #650

Job	Run time
build (gcc)	1m 40s
test (gcc)	4m 3s
test (gcc, --disable-xft)	4m 42s
test (gcc, --enable-symbols)	3m 33s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 39s
build (gcc, --disable-shared)	1m 46s
build (gcc, --disable-xft)	2m 4s
build (gcc, --disable-xss)	1m 41s
build (gcc, --enable-symbols)	1m 36s
build (clang)	1m 48s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 48s
build (clang, --disable-shared)	1m 47s
build (clang, --disable-xft)	1m 52s
build (clang, --disable-xss)	1m 53s
build (clang, --enable-symbols)	1m 26s
	33m 18s

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