stagefright amr: Avoid C++/C99 for loops with variable declaration

This makes the code compileable in C89 mode, too.

Change-Id: I9b76f8bfca148d1aec6081b8db139f351d64cfed

Author: mstorsjo

media/libstagefright/codecs/amrnb/enc/src/ton_stab.cpp

@@ -791,7 +791,8 @@ void update_gp_clipping(tonStabState *st, /* i/o : State struct            */
                        )
 {
     OSCL_UNUSED_ARG(pOverflow);
-    for (int i = 0; i < N_FRAME - 1; i++)
+    int i;
+    for (i = 0; i < N_FRAME - 1; i++)
     {
         st->gp[i] = st->gp[i+1];
     }

media/libstagefright/codecs/amrwb/src/get_amr_wb_bits.cpp

@@ -119,8 +119,9 @@ int16 Serial_parm(                        /* Return the parameter    */
 )
 {
     int16 value = 0;
+    int16 i;
 
-    for (int16 i = no_of_bits >> 1; i != 0; i--)
+    for (i = no_of_bits >> 1; i != 0; i--)
     {
         value <<= 2;
 

media/libstagefright/codecs/amrwb/src/oversamp_12k8_to_16k.cpp

@@ -240,11 +240,11 @@ void AmrWbUp_samp(
 {
 
     int32 i;
-    int16 frac;
+    int16 frac, j;
     int16 * pt_sig_u = sig_u;
 
     frac = 1;
-    for (int16 j = 0; j < L_frame; j++)
+    for (j = 0; j < L_frame; j++)
     {
         i = ((int32)j * INV_FAC5) >> 13;       /* integer part = pos * 1/5 */