crc: Fix code style with crc functions

Some of these have a space before the bracket. Drop it to fix the style.
Add some missing function comments while here.

Note that u32 and u8 cannot be used here since crc.h is included on the
host side.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/envcrc.c b/tools/envcrc.c
index 4b3b828..6e43608 100644
--- a/tools/envcrc.c
+++ b/tools/envcrc.c
@@ -58,7 +58,7 @@
 extern env_t embedded_environment;
 #endif	/* CONFIG_BUILD_ENVCRC */
 
-extern uint32_t crc32 (uint32_t, const unsigned char *, unsigned int);
+extern uint32_t crc32(uint32_t, const unsigned char *, unsigned int);
 
 int main (int argc, char **argv)
 {
@@ -88,7 +88,7 @@
 			memset(dataptr + eoe, pad, datasize - eoe);
 	}
 
-	crc = crc32 (0, dataptr, datasize);
+	crc = crc32(0, dataptr, datasize);
 
 	/* Check if verbose mode is activated passing a parameter to the program */
 	if (argc > 1) {