Use consistent/modern code formatting for pointers

The convention used by libjpeg:

    type * variable;

is not very common anymore, because it looks too much like
multiplication.  Some (particularly C++ programmers) prefer to tuck the
pointer symbol against the type:

    type* variable;

to emphasize that a pointer to a type is effectively a new type.
However, this can also be confusing, since defining multiple variables
on the same line would not work properly:

    type* variable1, variable2;  /* Only variable1 is actually a
                                    pointer. */

This commit reformats the entirety of the libjpeg-turbo code base so
that it uses the same code formatting convention for pointers that the
TurboJPEG API code uses:

    type *variable1, *variable2;

This seems to be the most common convention among C programmers, and
it is the convention used by other codec libraries, such as libpng and
libtiff.
diff --git a/jdatasrc.c b/jdatasrc.c
index 1f46a96..acbeb8a 100644
--- a/jdatasrc.c
+++ b/jdatasrc.c
@@ -29,12 +29,12 @@
 typedef struct {
   struct jpeg_source_mgr pub;   /* public fields */
 
-  FILE * infile;                /* source stream */
-  JOCTET * buffer;              /* start of buffer */
+  FILE *infile;                 /* source stream */
+  JOCTET *buffer;               /* start of buffer */
   boolean start_of_file;        /* have we gotten any data yet? */
 } my_source_mgr;
 
-typedef my_source_mgr * my_src_ptr;
+typedef my_source_mgr *my_src_ptr;
 
 #define INPUT_BUF_SIZE  4096    /* choose an efficiently fread'able size */
 
@@ -162,7 +162,7 @@
 METHODDEF(void)
 skip_input_data (j_decompress_ptr cinfo, long num_bytes)
 {
-  struct jpeg_source_mgr * src = cinfo->src;
+  struct jpeg_source_mgr *src = cinfo->src;
 
   /* Just a dumb implementation for now.  Could use fseek() except
    * it doesn't work on pipes.  Not clear that being smart is worth
@@ -214,7 +214,7 @@
  */
 
 GLOBAL(void)
-jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile)
+jpeg_stdio_src (j_decompress_ptr cinfo, FILE *infile)
 {
   my_src_ptr src;
 
@@ -255,9 +255,9 @@
 
 GLOBAL(void)
 jpeg_mem_src (j_decompress_ptr cinfo,
-              const unsigned char * inbuffer, unsigned long insize)
+              const unsigned char *inbuffer, unsigned long insize)
 {
-  struct jpeg_source_mgr * src;
+  struct jpeg_source_mgr *src;
 
   if (inbuffer == NULL || insize == 0)  /* Treat empty input as fatal error */
     ERREXIT(cinfo, JERR_INPUT_EMPTY);