binman: elf: Check for ELF_TOOLS availability and remove extra semicolon

Check if elf tools are available when running DecodeElf(). Also
remove superfuous semicolon at line ending.

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Revert part of patch to make binman test pass
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/elf.py b/tools/binman/elf.py
index 4219001..2ecc95f 100644
--- a/tools/binman/elf.py
+++ b/tools/binman/elf.py
@@ -447,13 +447,15 @@
     Returns:
         ElfInfo object containing information about the decoded ELF file
     """
+    if not ELF_TOOLS:
+        raise ValueError("Python: No module named 'elftools'")
     file_size = len(data)
     with io.BytesIO(data) as fd:
         elf = ELFFile(fd)
-        data_start = 0xffffffff;
-        data_end = 0;
-        mem_end = 0;
-        virt_to_phys = 0;
+        data_start = 0xffffffff
+        data_end = 0
+        mem_end = 0
+        virt_to_phys = 0
 
         for i in range(elf.num_segments()):
             segment = elf.get_segment(i)