Remove unnecessary warning options

Both -Wmissing-field-initializers and -Wsign-compare are both covered by
-Wextra which is enabled at W=1 anyway. Therefore, the explicit options
are not required.

Change-Id: I2e7d95b5fc14af7c70895859a7ebbeac5bc0d2a4
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>

Makefile

@@ -247,8 +247,6 @@ WARNING2 += -Wcast-align
 WARNING2 += -Wnested-externs
 WARNING2 += -Wshadow
 WARNING2 += -Wlogical-op
-WARNING2 += -Wmissing-field-initializers
-WARNING2 += -Wsign-compare
 
 WARNING3 := -Wbad-function-cast
 WARNING3 += -Wcast-qual

docs/process/security-hardening.rst

@@ -37,8 +37,7 @@ Several build options can be used to check for security issues. Refer to the
   - W=2
 
     Adds ``Waggregate-return``, ``Wcast-align``, ``Wnested-externs``,
-    ``Wshadow``, ``Wlogical-op``, ``Wmissing-field-initializers`` and
-    ``Wsign-compare``.
+    ``Wshadow``, ``Wlogical-op``.
 
   - W=3