arm: m53evk: Test if bootscript exists before loading it

Make sure the boot.scr exists on the card before loading it
from the card to avoid annoying message on the console.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

include/configs/m53evk.h

@@ -348,10 +348,12 @@
 		"bootm ${kernel_addr_r}\0"				\
 	"try_bootscript="						\
 		"mmc rescan;"						\
+		"if test -e mmc 0:1 ${bootscript} ; then "		\
 		"if ext4load mmc 0:1 ${kernel_addr_r} ${bootscript};"	\
 		"then;"							\
 			"\techo Running bootscript...;"			\
 			"\tsource ${kernel_addr_r};"			\
+		"fi ; "							\
 		"fi\0"
 
 #endif	/* __M53EVK_CONFIG_H__ */