100l: really fix fft external API init functions

Originally committed as revision 24228 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avfft.c

@@ -26,9 +26,7 @@ FFTContext *av_fft_init(int nbits, int inverse)
 {
     FFTContext *s = av_malloc(sizeof(*s));
 
-    if (s)
+    if (s && ff_fft_init(s, nbits, inverse))
-        ff_fft_init(s, nbits, inverse);
-    else
         av_freep(&s);
 
     return s;
@@ -58,9 +56,7 @@ FFTContext *av_mdct_init(int nbits, int inverse, double scale)
 {
     FFTContext *s = av_malloc(sizeof(*s));
 
-    if (s)
+    if (s && ff_mdct_init(s, nbits, inverse, scale))
-        ff_mdct_init(s, nbits, inverse, scale);
-    else
         av_freep(&s);
 
     return s;
@@ -97,9 +93,7 @@ RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans)
 {
     RDFTContext *s = av_malloc(sizeof(*s));
 
-    if (s)
+    if (s && ff_rdft_init(s, nbits, trans))
-        ff_rdft_init(s, nbits, trans);
-    else
         av_freep(&s);
 
     return s;
@@ -126,9 +120,7 @@ DCTContext *av_dct_init(int nbits, enum DCTTransformType inverse)
 {
     DCTContext *s = av_malloc(sizeof(*s));
 
-    if (s)
+    if (s && (ff_dct_init(s, nbits, inverse)))
-        ff_dct_init(s, nbits, inverse);
-    else
         av_freep(&s);
 
     return s;