[patch] x86, efi: fix pointer math issue in handle_ramdisks()

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"filename" is a efi_char16_t string so this check for reaching the end
of the array doesn't work.  We need to cast it to char pointer before
doing the math.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index fec216f..cf4cdb7 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -559,7 +559,7 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 			str++;
 
 		while (*str && *str != ' ' && *str != '\n') {
-			if (p >= filename + sizeof(filename))
+			if ((char *)p >= (char *)filename + sizeof(filename))
 				break;
 
 			*p++ = *str++;
--
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