The incorrect substitution made it rebuild every time.
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Tom Rini <trini@ti.com>
Acked-by: Simon Glass <sjg@chromium.org>
 BIN_FILES-$(CONFIG_NETCONSOLE) += ncb$(SFX)
 BIN_FILES-$(CONFIG_SHA1_CHECK_UB_IMG) += ubsha1$(SFX)
 BIN_FILES-$(CONFIG_KIRKWOOD) += kwboot$(SFX)
-BIN_FILES-y += proftool(SFX)
+BIN_FILES-y += proftool$(SFX)
 BIN_FILES-$(CONFIG_STATIC_RELA) += relocate-rela$(SFX)
 
 # Source files which exist outside the tools directory
        $(HOSTCC) $(HOSTCFLAGS) $(HOSTLDFLAGS) -o $@ $^
        $(HOSTSTRIP) $@
 
-$(obj)proftool(SFX):   $(obj)proftool.o
+$(obj)proftool$(SFX):  $(obj)proftool.o
        $(HOSTCC) $(HOSTCFLAGS) $(HOSTLDFLAGS) -o $@ $^
        $(HOSTSTRIP) $@