fdt: Fix mkimage list to try every header type

Signed-off-by: Jordan Hand <jorhand@microsoft.com>
Tested-by: Vagrant Cascadian <vagrant@debian.org>
Tested-by: Alex Kiernan <alex.kiernan@gmail.com>
diff --git a/tools/mkimage.c b/tools/mkimage.c
index 2899adf..d1e1a67 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -403,14 +403,21 @@
 			exit (EXIT_FAILURE);
 		}
 
-		/*
-		 * scan through mkimage registry for all supported image types
-		 * and verify the input image file header for match
-		 * Print the image information for matched image type
-		 * Returns the error code if not matched
-		 */
-		retval = imagetool_verify_print_header_by_type(ptr, &sbuf,
-				tparams, &params);
+		if (params.fflag) {
+			/*
+			 * Verifies the header format based on the expected header for image
+			 * type in tparams
+			 */
+			retval = imagetool_verify_print_header_by_type(ptr, &sbuf,
+					tparams, &params);
+		} else {
+			/**
+			 * When listing the image, we are not given the image type. Simply check all
+			 * image types to find one that matches our header
+			 */
+			retval = imagetool_verify_print_header(ptr, &sbuf,
+					tparams, &params);
+		}
 
 		(void) munmap((void *)ptr, sbuf.st_size);
 		(void) close (ifd);