of: reserved_mem: Fix typo in the too-many-regions message

Minor fix for a missing preposition in the error message that appears
when there are too many reserved memory regions for the allocated array
to store.
Signed-off-by: NDanny Lin <danny@kdrag0n.dev>
Link: https://lore.kernel.org/r/20200604054900.200317-1-danny@kdrag0n.devSigned-off-by: NRob Herring <robh@kernel.org>

drivers/of/of_reserved_mem.c

@@ -54,7 +54,7 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
 	struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
 
 	if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
-		pr_err("not enough space all defined regions.\n");
+		pr_err("not enough space for all defined regions.\n");
 		return;
 	}