Fix GCC 5.1 compile issue seen at Linux Arch

rmodule.c: In function ‘rmodule_create’:
rmodule.c:287:29: error: ‘phdr’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
        (phdr->p_vaddr + phdr->p_memsz))) {
                             ^
rmodule.c:204:14: note: ‘phdr’ was declared here
  Elf64_Phdr *phdr;
              ^

Change-Id: I94a235253610348484eef218ec855103a3bb5da5
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Reviewed-on: http://review.coreboot.org/10881
Tested-by: build bot (Jenkins)
Reviewed-by: Francis Rowe <info@gluglug.org.uk>
diff --git a/util/cbfstool/rmodule.c b/util/cbfstool/rmodule.c
index b94e0c2..f93f4f6 100644
--- a/util/cbfstool/rmodule.c
+++ b/util/cbfstool/rmodule.c
@@ -201,7 +201,7 @@
 	int i;
 	int nsegments;
 	struct parsed_elf *pelf;
-	Elf64_Phdr *phdr;
+	Elf64_Phdr *phdr = NULL;
 
 	pelf = &ctx->pelf;