decompressors: group XZ_DEC_* symbols under an if XZ_BCJ / endif

Group all architecture-specific BCJ filter configuration symbols under an
if XZ_BCJ / endif statement.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/xz/Kconfig

@@ -6,42 +6,40 @@ config XZ_DEC
 	  the .xz file format as the container. For integrity checking,
 	  CRC32 is supported. See Documentation/xz.txt for more information.
 
+if XZ_DEC
+
 config XZ_DEC_X86
 	bool "x86 BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
 config XZ_DEC_POWERPC
 	bool "PowerPC BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
 config XZ_DEC_IA64
 	bool "IA-64 BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
 config XZ_DEC_ARM
 	bool "ARM BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
 config XZ_DEC_ARMTHUMB
 	bool "ARM-Thumb BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
 config XZ_DEC_SPARC
 	bool "SPARC BCJ filter decoder" if EXPERT
 	default y
-	depends on XZ_DEC
 	select XZ_DEC_BCJ
 
+endif
+
 config XZ_DEC_BCJ
 	bool
 	default n