target-ppc: Fix target_disas

Inspect only bit 16 for the Little Endian test.  Correct comment preceding
the target_disas() function.  Correct grammar in comment for flags processing.
Signed-off-by: NTom Musta <tommusta@gmail.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

disas.c

@@ -191,7 +191,8 @@ static int print_insn_od_target(bfd_vma pc, disassemble_info *info)
    values:
     i386 - 1 means 16 bit code, 2 means 64 bit code
     arm  - bit 0 = thumb, bit 1 = reverse endian, bit 2 = A64
-    ppc  - nonzero means little endian
+    ppc  - bits 0:15 specify (optionally) the machine instruction set;
+           bit 16 indicates little endian.
     other targets - unused
  */
 void target_disas(FILE *out, CPUArchState *env, target_ulong code,
@@ -251,11 +252,11 @@ void target_disas(FILE *out, CPUArchState *env, target_ulong code,
     s.info.mach = bfd_mach_sparc_v9b;
 #endif
 #elif defined(TARGET_PPC)
-    if (flags >> 16) {
+    if ((flags >> 16) & 1) {
         s.info.endian = BFD_ENDIAN_LITTLE;
     }
     if (flags & 0xFFFF) {
-        /* If we have a precise definitions of the instructions set, use it */
+        /* If we have a precise definition of the instruction set, use it. */
         s.info.mach = flags & 0xFFFF;
     } else {
 #ifdef TARGET_PPC64