imx-gpu-viv: add a missing backslash

[Peter: add semicolon and || exit 1 to catch failures]
Signed-off-by: Laurent Hartanerot <laurent.hartanerot@atos.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

(cherry picked from commit 06a5d193edb859929ac37154ef1320b7907b31b0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/freescale-imx/imx-gpu-viv/imx-gpu-viv.mk

@@ -65,7 +65,7 @@ endif
 ifeq ($(IMX_GPU_VIV_LIB_TARGET),x11)
 define IMX_GPU_VIV_FIXUP_PKGCONFIG
 	for lib in egl gbm glesv1_cm glesv2 vg; do \
-		ln -sf $${lib}_x11.pc $(@D)/gpu-core/usr/lib/pkgconfig/$${lib}.pc
+		ln -sf $${lib}_x11.pc $(@D)/gpu-core/usr/lib/pkgconfig/$${lib}.pc || exit 1; \
 	done
 endef
 endif