Fix indentation for source file list
diff --git a/Makefile.am b/Makefile.am
index d377089..ec1ca97 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -180,10 +180,10 @@
 bin_PROGRAMS += attrib/gatttool
 
 attrib_gatttool_SOURCES = attrib/gatttool.c attrib/att.c attrib/gatt.c \
-			  attrib/gattrib.c btio/btio.c \
-			  src/glib-helper.h src/glib-helper.c \
-			  attrib/gatttool.h attrib/interactive.c \
-			  attrib/utils.c
+				attrib/gattrib.c btio/btio.c \
+				src/glib-helper.h src/glib-helper.c \
+				attrib/gatttool.h attrib/interactive.c \
+				attrib/utils.c
 attrib_gatttool_LDADD = lib/libbluetooth.la @GLIB_LIBS@ @READLINE_LIBS@
 endif