Another compile fix

src/col2im.c

@@ -66,17 +66,18 @@ void col2im_cpu_ext(const float* data_col, const int channels,
     const int output_w = (width + 2 * pad_w -
         (dilation_w * (kernel_w - 1) + 1)) / stride_w + 1;
     const int channel_size = height * width;
-    for (int channel = channels; channel--; data_im += channel_size) {
-        for (int kernel_row = 0; kernel_row < kernel_h; kernel_row++) {
-            for (int kernel_col = 0; kernel_col < kernel_w; kernel_col++) {
+    int channel, kernel_row, kernel_col, output_rows, output_col;
+    for (channel = channels; channel--; data_im += channel_size) {
+        for (kernel_row = 0; kernel_row < kernel_h; kernel_row++) {
+            for (kernel_col = 0; kernel_col < kernel_w; kernel_col++) {
                 int input_row = -pad_h + kernel_row * dilation_h;
-                for (int output_rows = output_h; output_rows; output_rows--) {
+                for (output_rows = output_h; output_rows; output_rows--) {
                     if (!is_a_ge_zero_and_a_lt_b(input_row, height)) {
                         data_col += output_w;
                     }
                     else {
                         int input_col = -pad_w + kernel_col * dilation_w;
-                        for (int output_col = output_w; output_col; output_col--) {
+                        for (output_col = output_w; output_col; output_col--) {
                             if (is_a_ge_zero_and_a_lt_b(input_col, width)) {
                                 data_im[input_row * width + input_col] += *data_col;
                             }

src/im2col.c

@@ -62,19 +62,20 @@ void im2col_cpu_ext(const float* data_im, const int channels,
     const int output_w = (width + 2 * pad_w -
         (dilation_w * (kernel_w - 1) + 1)) / stride_w + 1;
     const int channel_size = height * width;
-    for (int channel = channels; channel--; data_im += channel_size) {
-        for (int kernel_row = 0; kernel_row < kernel_h; kernel_row++) {
-            for (int kernel_col = 0; kernel_col < kernel_w; kernel_col++) {
+    int channel, kernel_row, kernel_col, output_rows, output_col;
+    for (channel = channels; channel--; data_im += channel_size) {
+        for (kernel_row = 0; kernel_row < kernel_h; kernel_row++) {
+            for (kernel_col = 0; kernel_col < kernel_w; kernel_col++) {
                 int input_row = -pad_h + kernel_row * dilation_h;
-                for (int output_rows = output_h; output_rows; output_rows--) {
+                for (output_rows = output_h; output_rows; output_rows--) {
                     if (!is_a_ge_zero_and_a_lt_b(input_row, height)) {
-                        for (int output_cols = output_w; output_cols; output_cols--) {
+                        for (output_col = output_w; output_col; output_col--) {
                             *(data_col++) = 0;
                         }
                     }
                     else {
                         int input_col = -pad_w + kernel_col * dilation_w;
-                        for (int output_col = output_w; output_col; output_col--) {
+                        for (output_col = output_w; output_col; output_col--) {
                             if (is_a_ge_zero_and_a_lt_b(input_col, width)) {
                                 *(data_col++) = data_im[input_row * width + input_col];
                             }