bootutil: whitespace fixes

Delete some trailing whitespace.

Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
diff --git a/boot/bootutil/src/loader.c b/boot/bootutil/src/loader.c
index 89b4e13..da72f78 100644
--- a/boot/bootutil/src/loader.c
+++ b/boot/bootutil/src/loader.c
@@ -232,7 +232,7 @@
             return boot_swap_trans_table[i][0];
         }
     }
-    
+
     /* XXX: Temporary assert. */
     assert(0);
 
@@ -571,7 +571,7 @@
 {
     const struct flash_area *fap;
     int rc;
-    
+
     if (boot_data.imgs[slot].hdr.ih_magic == 0xffffffff ||
         boot_data.imgs[slot].hdr.ih_flags & IMAGE_F_NON_BOOTABLE) {