Makefile: Correctly propagate failure when removing target

On more places is used pattern 'command > $@ || rm -f $@'. But it does not
propagate failure from 'command' as 'rm -f' returns success.

Fix it by calling 'false' to correctly propagate failure after 'rm -f'.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/Makefile b/Makefile
index 41446d8..c94cc39 100644
--- a/Makefile
+++ b/Makefile
@@ -1005,7 +1005,7 @@
 append = cat $(filter-out $< $(PHONY), $^) >> $@
 
 quiet_cmd_pad_cat = CAT     $@
-cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@
+cmd_pad_cat = $(cmd_objcopy) && $(append) || { rm -f $@; false; }
 
 quiet_cmd_lzma = LZMA    $@
 cmd_lzma = lzma -c -z -k -9 $< > $@
@@ -1312,7 +1312,7 @@
 shell_cmd = { $(call echo-cmd,$(1)) $(cmd_$(1)); }
 
 quiet_cmd_objcopy_uboot = OBJCOPY $@
-cmd_objcopy_uboot = $(cmd_objcopy) && $(call shell_cmd,static_rela,$<,$@,$(CONFIG_SYS_TEXT_BASE)) || rm -f $@
+cmd_objcopy_uboot = $(cmd_objcopy) && $(call shell_cmd,static_rela,$<,$@,$(CONFIG_SYS_TEXT_BASE)) || { rm -f $@; false; }
 
 u-boot-nodtb.bin: u-boot FORCE
 	$(call if_changed,objcopy_uboot)
@@ -1584,12 +1584,12 @@
 ifneq ($(CONFIG_ARCH_SOCFPGA),)
 quiet_cmd_gensplx4 = GENSPLX4 $@
 cmd_gensplx4 = cat	spl/u-boot-spl.sfp spl/u-boot-spl.sfp	\
-			spl/u-boot-spl.sfp spl/u-boot-spl.sfp > $@ || rm -f $@
+			spl/u-boot-spl.sfp spl/u-boot-spl.sfp > $@ || { rm -f $@; false; }
 spl/u-boot-splx4.sfp: spl/u-boot-spl.sfp FORCE
 	$(call if_changed,gensplx4)
 
 quiet_cmd_socboot = SOCBOOT $@
-cmd_socboot = cat	spl/u-boot-splx4.sfp u-boot.img > $@ || rm -f $@
+cmd_socboot = cat	spl/u-boot-splx4.sfp u-boot.img > $@ || { rm -f $@; false; }
 u-boot-with-spl.sfp: spl/u-boot-splx4.sfp u-boot.img FORCE
 	$(call if_changed,socboot)
 
@@ -1599,12 +1599,12 @@
 			spl/u-boot-spl.sfp spl/u-boot-spl.pad \
 			spl/u-boot-spl.sfp spl/u-boot-spl.pad \
 			spl/u-boot-spl.sfp spl/u-boot-spl.pad > $@ || \
-			rm -f $@ spl/u-boot-spl.pad
+			{ rm -f $@ spl/u-boot-spl.pad; false; }
 u-boot-spl-padx4.sfp: spl/u-boot-spl.sfp FORCE
 	$(call if_changed,gensplpadx4)
 
 quiet_cmd_socnandboot = SOCNANDBOOT $@
-cmd_socnandboot = cat	u-boot-spl-padx4.sfp u-boot.img > $@ || rm -f $@
+cmd_socnandboot = cat	u-boot-spl-padx4.sfp u-boot.img > $@ || { rm -f $@; false; }
 u-boot-with-nand-spl.sfp: u-boot-spl-padx4.sfp u-boot.img FORCE
 	$(call if_changed,socnandboot)